111992557 has 2 divisors, whose sum is σ = 111992558. Its totient is φ = 111992556.

The previous prime is 111992477. The next prime is 111992581. The reversal of 111992557 is 755299111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91661476 + 20331081 = 9574^2 + 4509^2 .

It is a cyclic number.

It is not a de Polignac number, because 111992557 - 2²³ = 103603949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111992357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55996278 + 55996279.

It is an arithmetic number, because the mean of its divisors is an integer number (55996279).

Almost surely, 2^111992557 is an apocalyptic number.

It is an amenable number.

111992557 is a deficient number, since it is larger than the sum of its proper divisors (1).

111992557 is an equidigital number, since it uses as much as digits as its factorization.

111992557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 40.

The square root of 111992557 is about 10582.6535897194. The cubic root of 111992557 is about 482.0177748075.

The spelling of 111992557 in words is "one hundred eleven million, nine hundred ninety-two thousand, five hundred fifty-seven".