37139561 has 2 divisors, whose sum is σ = 37139562. Its totient is φ = 37139560.

The previous prime is 37139513. The next prime is 37139567. The reversal of 37139561 is 16593173.

37139561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30085225 + 7054336 = 5485^2 + 2656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37139561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (37139567) 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 as a sum of consecutive naturals, namely, 18569780 + 18569781.

It is an arithmetic number, because the mean of its divisors is an integer number (18569781).

Almost surely, 2^37139561 is an apocalyptic number.

It is an amenable number.

37139561 is a deficient number, since it is larger than the sum of its proper divisors (1).

37139561 is an equidigital number, since it uses as much as digits as its factorization.

37139561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 35.

The square root of 37139561 is about 6094.2235764698. The cubic root of 37139561 is about 333.6406218565.

The spelling of 37139561 in words is "thirty-seven million, one hundred thirty-nine thousand, five hundred sixty-one".