37391881 has 2 divisors, whose sum is σ = 37391882. Its totient is φ = 37391880.

The previous prime is 37391869. The next prime is 37391903. The reversal of 37391881 is 18819373.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37100281 + 291600 = 6091^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 37391881 - 2¹⁷ = 37260809 is a prime.

It is a super-2 number, since 2×37391881² = 2796305529436322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (37391831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18695940 + 18695941.

It is an arithmetic number, because the mean of its divisors is an integer number (18695941).

Almost surely, 2^37391881 is an apocalyptic number.

It is an amenable number.

37391881 is a deficient number, since it is larger than the sum of its proper divisors (1).

37391881 is an equidigital number, since it uses as much as digits as its factorization.

37391881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 37391881 is about 6114.8901053085. The cubic root of 37391881 is about 334.3944835184.

The spelling of 37391881 in words is "thirty-seven million, three hundred ninety-one thousand, eight hundred eighty-one".