18937117 has 2 divisors, whose sum is σ = 18937118. Its totient is φ = 18937116.

The previous prime is 18937111. The next prime is 18937141. The reversal of 18937117 is 71173981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 1052676 = 4229^2 + 1026^2 .

It is a cyclic number.

It is not a de Polignac number, because 18937117 - 2¹⁵ = 18904349 is a prime.

It is a super-2 number, since 2×18937117² = 717228800543378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18937111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9468558 + 9468559.

It is an arithmetic number, because the mean of its divisors is an integer number (9468559).

Almost surely, 2^18937117 is an apocalyptic number.

It is an amenable number.

18937117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18937117 is an equidigital number, since it uses as much as digits as its factorization.

18937117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 37.

The square root of 18937117 is about 4351.6797906096. The cubic root of 18937117 is about 266.5454586309.

The spelling of 18937117 in words is "eighteen million, nine hundred thirty-seven thousand, one hundred seventeen".