113521631 has 16 divisors (see below), whose sum is σ = 124869600. Its totient is φ = 102724608.

The previous prime is 113521627. The next prime is 113521633. The reversal of 113521631 is 136125311.

It is not a de Polignac number, because 113521631 - 2² = 113521627 is a prime.

It is a super-2 number, since 2×113521631² = 25774321409800322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113521597 and 113521606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113521633) 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, 201356 + ... + 201918.

It is an arithmetic number, because the mean of its divisors is an integer number (7804350).

Almost surely, 2^113521631 is an apocalyptic number.

113521631 is a deficient number, since it is larger than the sum of its proper divisors (11347969).

113521631 is a wasteful number, since it uses less digits than its factorization.

113521631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its digits is 540, while the sum is 23.

The square root of 113521631 is about 10654.6530210983. The cubic root of 113521631 is about 484.2015857113.

Adding to 113521631 its reverse (136125311), we get a palindrome (249646942).

The spelling of 113521631 in words is "one hundred thirteen million, five hundred twenty-one thousand, six hundred thirty-one".