111661637 has 2 divisors, whose sum is σ = 111661638. Its totient is φ = 111661636.

The previous prime is 111661609. The next prime is 111661657. The reversal of 111661637 is 736166111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107205316 + 4456321 = 10354^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 111661637 - 2²⁴ = 94884421 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 (111661657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55830818 + 55830819.

It is an arithmetic number, because the mean of its divisors is an integer number (55830819).

Almost surely, 2^111661637 is an apocalyptic number.

It is an amenable number.

111661637 is a deficient number, since it is larger than the sum of its proper divisors (1).

111661637 is an equidigital number, since it uses as much as digits as its factorization.

111661637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 111661637 is about 10567.0070029313. The cubic root of 111661637 is about 481.5425447480.

The spelling of 111661637 in words is "one hundred eleven million, six hundred sixty-one thousand, six hundred thirty-seven".