113613521 has 16 divisors (see below), whose sum is σ = 137573760. Its totient is φ = 91653120.

The previous prime is 113613473. The next prime is 113613547. The reversal of 113613521 is 125316311.

It is a cyclic number.

It is not a de Polignac number, because 113613521 - 2¹⁰ = 113612497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113613551) 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, 18161 + ... + 23601.

It is an arithmetic number, because the mean of its divisors is an integer number (8598360).

Almost surely, 2^113613521 is an apocalyptic number.

It is an amenable number.

113613521 is a deficient number, since it is larger than the sum of its proper divisors (23960239).

113613521 is a wasteful number, since it uses less digits than its factorization.

113613521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624.

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

The square root of 113613521 is about 10658.9643493165. The cubic root of 113613521 is about 484.3321960150.

Adding to 113613521 its reverse (125316311), we get a palindrome (238929832).

The spelling of 113613521 in words is "one hundred thirteen million, six hundred thirteen thousand, five hundred twenty-one".