111788551 has 12 divisors (see below), whose sum is σ = 130372680. Its totient is φ = 95573520.

The previous prime is 111788531. The next prime is 111788561. The reversal of 111788551 is 155887111.

It is not a de Polignac number, because 111788551 - 2⁷ = 111788423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111788551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111788531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17920 + ... + 23338.

It is an arithmetic number, because the mean of its divisors is an integer number (10864390).

Almost surely, 2^111788551 is an apocalyptic number.

111788551 is a deficient number, since it is larger than the sum of its proper divisors (18584129).

111788551 is an equidigital number, since it uses as much as digits as its factorization.

111788551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5854 (or 5847 counting only the distinct ones).

The product of its digits is 11200, while the sum is 37.

The square root of 111788551 is about 10573.0104984342. The cubic root of 111788551 is about 481.7249152041.

The spelling of 111788551 in words is "one hundred eleven million, seven hundred eighty-eight thousand, five hundred fifty-one".