113431555 has 4 divisors (see below), whose sum is σ = 136117872. Its totient is φ = 90745240.

The previous prime is 113431523. The next prime is 113431579. The reversal of 113431555 is 555134311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555134311 = 179 ⋅3101309.

It is not a de Polignac number, because 113431555 - 2⁵ = 113431523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11343151 + ... + 11343160.

It is an arithmetic number, because the mean of its divisors is an integer number (34029468).

Almost surely, 2^113431555 is an apocalyptic number.

113431555 is a deficient number, since it is larger than the sum of its proper divisors (22686317).

113431555 is an equidigital number, since it uses as much as digits as its factorization.

113431555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22686316.

The product of its digits is 4500, while the sum is 28.

The square root of 113431555 is about 10650.4251088865. The cubic root of 113431555 is about 484.0734853588.

Adding to 113431555 its reverse (555134311), we get a palindrome (668565866).

The spelling of 113431555 in words is "one hundred thirteen million, four hundred thirty-one thousand, five hundred fifty-five".