111550551 has 8 divisors (see below), whose sum is σ = 169981824. Its totient is φ = 63743160.

The previous prime is 111550519. The next prime is 111550567. The reversal of 111550551 is 155055111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111550551 - 2⁵ = 111550519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111550591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2655945 + ... + 2655986.

It is an arithmetic number, because the mean of its divisors is an integer number (21247728).

Almost surely, 2^111550551 is an apocalyptic number.

111550551 is a deficient number, since it is larger than the sum of its proper divisors (58431273).

111550551 is an equidigital number, since it uses as much as digits as its factorization.

111550551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5311941.

The product of its (nonzero) digits is 625, while the sum is 24.

The square root of 111550551 is about 10561.7494289535. The cubic root of 111550551 is about 481.3828050638.

It can be divided in two parts, 111550 and 551, that added together give a triangular number (112101 = T₄₇₃).

The spelling of 111550551 in words is "one hundred eleven million, five hundred fifty thousand, five hundred fifty-one".