37139681 has 4 divisors (see below), whose sum is σ = 37193364. Its totient is φ = 37086000.

The previous prime is 37139677. The next prime is 37139689. The reversal of 37139681 is 18693173.

37139681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35224225 + 1915456 = 5935^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 37139681 - 2² = 37139677 is a prime.

It is a super-2 number, since 2×37139681² = 2758711809563522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (37139689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25790 + ... + 27191.

It is an arithmetic number, because the mean of its divisors is an integer number (9298341).

Almost surely, 2^37139681 is an apocalyptic number.

It is an amenable number.

37139681 is a deficient number, since it is larger than the sum of its proper divisors (53683).

37139681 is an equidigital number, since it uses as much as digits as its factorization.

37139681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53682.

The product of its digits is 27216, while the sum is 38.

The square root of 37139681 is about 6094.2334218505. The cubic root of 37139681 is about 333.6409811933.

The spelling of 37139681 in words is "thirty-seven million, one hundred thirty-nine thousand, six hundred eighty-one".