1201131520 has 104 divisors (see below), whose sum is σ = 2906297856. Its totient is φ = 476479488.

The previous prime is 1201131517. The next prime is 1201131539. The reversal of 1201131520 is 251311021.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1201131494 and 1201131503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4566909 + ... + 4567171.

Almost surely, 2^1201131520 is an apocalyptic number.

1201131520 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 1201131520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1453148928).

1201131520 is an abundant number, since it is smaller than the sum of its proper divisors (1705166336).

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

1201131520 is an equidigital number, since it uses as much as digits as its factorization.

1201131520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1201131520 is about 34657.3443875898. The cubic root of 1201131520 is about 1062.9924696516.

Adding to 1201131520 its reverse (251311021), we get a palindrome (1452442541).

The spelling of 1201131520 in words is "one billion, two hundred one million, one hundred thirty-one thousand, five hundred twenty".