11531612120 has 64 divisors (see below), whose sum is σ = 30941982720. Its totient is φ = 3781793664.

The previous prime is 11531612119. The next prime is 11531612129. The reversal of 11531612120 is 2121613511.

It is a super-2 number, since 2×11531612120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531612129) 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, 888872 + ... + 901751.

It is an arithmetic number, because the mean of its divisors is an integer number (483468480).

Almost surely, 2^11531612120 is an apocalyptic number.

11531612120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11531612120 is an abundant number, since it is smaller than the sum of its proper divisors (19410370600).

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

11531612120 is a wasteful number, since it uses less digits than its factorization.

11531612120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790664 (or 1790660 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The spelling of 11531612120 in words is "eleven billion, five hundred thirty-one million, six hundred twelve thousand, one hundred twenty".