111978137 has 2 divisors, whose sum is σ = 111978138. Its totient is φ = 111978136.

The previous prime is 111978121. The next prime is 111978151. The reversal of 111978137 is 731879111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89661961 + 22316176 = 9469^2 + 4724^2 .

It is a cyclic number.

It is not a de Polignac number, because 111978137 - 2⁴ = 111978121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111978137.

It is not a weakly prime, because it can be changed into another prime (111978157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55989068 + 55989069.

It is an arithmetic number, because the mean of its divisors is an integer number (55989069).

Almost surely, 2^111978137 is an apocalyptic number.

It is an amenable number.

111978137 is a deficient number, since it is larger than the sum of its proper divisors (1).

111978137 is an equidigital number, since it uses as much as digits as its factorization.

111978137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 38.

The square root of 111978137 is about 10581.9722641859. The cubic root of 111978137 is about 481.9970859485.

The spelling of 111978137 in words is "one hundred eleven million, nine hundred seventy-eight thousand, one hundred thirty-seven".