111954551 has 4 divisors (see below), whose sum is σ = 111986112. Its totient is φ = 111922992.

The previous prime is 111954541. The next prime is 111954553. The reversal of 111954551 is 155459111.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111954551 is a prime.

It is a super-2 number, since 2×111954551² = 25067642979223202, which 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 (111954553) 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, 9671 + ... + 17816.

It is an arithmetic number, because the mean of its divisors is an integer number (27996528).

Almost surely, 2^111954551 is an apocalyptic number.

111954551 is a deficient number, since it is larger than the sum of its proper divisors (31561).

111954551 is an equidigital number, since it uses as much as digits as its factorization.

111954551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31560.

The product of its digits is 4500, while the sum is 32.

The square root of 111954551 is about 10580.8577629604. The cubic root of 111954551 is about 481.9632424923.

The spelling of 111954551 in words is "one hundred eleven million, nine hundred fifty-four thousand, five hundred fifty-one".