37313561 has 2 divisors, whose sum is σ = 37313562. Its totient is φ = 37313560.

The previous prime is 37313557. The next prime is 37313581. The reversal of 37313561 is 16531373.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33131536 + 4182025 = 5756^2 + 2045^2 .

It is an emirp because it is prime and its reverse (16531373) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37313561 - 2² = 37313557 is a prime.

It is not a weakly prime, because it can be changed into another prime (37313581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18656780 + 18656781.

It is an arithmetic number, because the mean of its divisors is an integer number (18656781).

Almost surely, 2^37313561 is an apocalyptic number.

It is an amenable number.

37313561 is a deficient number, since it is larger than the sum of its proper divisors (1).

37313561 is an equidigital number, since it uses as much as digits as its factorization.

37313561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 29.

The square root of 37313561 is about 6108.4827084964. The cubic root of 37313561 is about 334.1608491748.

The spelling of 37313561 in words is "thirty-seven million, three hundred thirteen thousand, five hundred sixty-one".