113231551 has 4 divisors (see below), whose sum is σ = 113257872. Its totient is φ = 113205232.

The previous prime is 113231519. The next prime is 113231557. The reversal of 113231551 is 155132311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155132311 = 1117 ⋅138883.

It is a cyclic number.

It is not a de Polignac number, because 113231551 - 2⁵ = 113231519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113231557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5035 + ... + 15868.

It is an arithmetic number, because the mean of its divisors is an integer number (28314468).

Almost surely, 2^113231551 is an apocalyptic number.

113231551 is a deficient number, since it is larger than the sum of its proper divisors (26321).

113231551 is an equidigital number, since it uses as much as digits as its factorization.

113231551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26320.

The product of its digits is 450, while the sum is 22.

The square root of 113231551 is about 10641.0314819570. The cubic root of 113231551 is about 483.7888097470.

Adding to 113231551 its reverse (155132311), we get a palindrome (268363862).

The spelling of 113231551 in words is "one hundred thirteen million, two hundred thirty-one thousand, five hundred fifty-one".