111978157 has 2 divisors, whose sum is σ = 111978158. Its totient is φ = 111978156.

The previous prime is 111978151. The next prime is 111978173. The reversal of 111978157 is 751879111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103103716 + 8874441 = 10154^2 + 2979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111978157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111978151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55989078 + 55989079.

It is an arithmetic number, because the mean of its divisors is an integer number (55989079).

Almost surely, 2^111978157 is an apocalyptic number.

It is an amenable number.

111978157 is a deficient number, since it is larger than the sum of its proper divisors (1).

111978157 is an equidigital number, since it uses as much as digits as its factorization.

111978157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 40.

The square root of 111978157 is about 10581.9732091893. The cubic root of 111978157 is about 481.9971146444.

The spelling of 111978157 in words is "one hundred eleven million, nine hundred seventy-eight thousand, one hundred fifty-seven".