111551615431 has 4 divisors (see below), whose sum is σ = 111554110872. Its totient is φ = 111549119992.

The previous prime is 111551615429. The next prime is 111551615443. The reversal of 111551615431 is 134516155111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111551615431 - 2¹ = 111551615429 is a prime.

It is a super-2 number, since 2×111551615431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111551615411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1179421 + ... + 1270486.

It is an arithmetic number, because the mean of its divisors is an integer number (27888527718).

Almost surely, 2^111551615431 is an apocalyptic number.

111551615431 is a deficient number, since it is larger than the sum of its proper divisors (2495441).

111551615431 is an equidigital number, since it uses as much as digits as its factorization.

111551615431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495440.

The product of its digits is 9000, while the sum is 34.

The spelling of 111551615431 in words is "one hundred eleven billion, five hundred fifty-one million, six hundred fifteen thousand, four hundred thirty-one".