1520231356 has 48 divisors (see below), whose sum is σ = 3116961792. Its totient is φ = 635241600.

The previous prime is 1520231353. The next prime is 1520231357. The reversal of 1520231356 is 6531320251.

It is a super-2 number, since 2×1520231356² = 4622206751531197472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520231353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367741 + ... + 371851.

It is an arithmetic number, because the mean of its divisors is an integer number (64936704).

Almost surely, 2^1520231356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1520231356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1558480896).

1520231356 is an abundant number, since it is smaller than the sum of its proper divisors (1596730436).

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

1520231356 is a wasteful number, since it uses less digits than its factorization.

1520231356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450 (or 4448 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 1520231356 is about 38990.1443444366. The cubic root of 1520231356 is about 1149.8377479976.

The spelling of 1520231356 in words is "one billion, five hundred twenty million, two hundred thirty-one thousand, three hundred fifty-six".