1315534220 has 192 divisors, whose sum is σ = 3871881216. Its totient is φ = 361912320.

The previous prime is 1315534193. The next prime is 1315534229. The reversal of 1315534220 is 224355131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 1315534220.

It is not an unprimeable number, because it can be changed into a prime (1315534229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 459032 + ... + 461888.

It is an arithmetic number, because the mean of its divisors is an integer number (20166048).

Almost surely, 2^1315534220 is an apocalyptic number.

1315534220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1315534220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1935940608).

1315534220 is an abundant number, since it is smaller than the sum of its proper divisors (2556346996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1315534220 is a wasteful number, since it uses less digits than its factorization.

1315534220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920 (or 2918 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1315534220 is about 36270.2939056192. The cubic root of 1315534220 is about 1095.7228451431.

Adding to 1315534220 its reverse (224355131), we get a palindrome (1539889351).

Subtracting from 1315534220 its reverse (224355131), we obtain a square (1091179089 = 33033²).

It can be divided in two parts, 1315 and 534220, that added together give a palindrome (535535).

The spelling of 1315534220 in words is "one billion, three hundred fifteen million, five hundred thirty-four thousand, two hundred twenty".