37991113 has 2 divisors, whose sum is σ = 37991114. Its totient is φ = 37991112.

The previous prime is 37991111. The next prime is 37991123. The reversal of 37991113 is 31119973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37063744 + 927369 = 6088^2 + 963^2 .

It is a cyclic number.

It is not a de Polignac number, because 37991113 - 2¹ = 37991111 is a prime.

It is a super-3 number, since 3×37991113³ (a number of 24 digits) contains 333 as substring.

Together with 37991111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (37991111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18995556 + 18995557.

It is an arithmetic number, because the mean of its divisors is an integer number (18995557).

Almost surely, 2^37991113 is an apocalyptic number.

It is an amenable number.

37991113 is a deficient number, since it is larger than the sum of its proper divisors (1).

37991113 is an equidigital number, since it uses as much as digits as its factorization.

37991113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5103, while the sum is 34.

The square root of 37991113 is about 6163.6931299344. The cubic root of 37991113 is about 336.1713299738.

The spelling of 37991113 in words is "thirty-seven million, nine hundred ninety-one thousand, one hundred thirteen".