37716521 has 2 divisors, whose sum is σ = 37716522. Its totient is φ = 37716520.

The previous prime is 37716493. The next prime is 37716533. The reversal of 37716521 is 12561773.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25361296 + 12355225 = 5036^2 + 3515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37716521 is a prime.

It is not a weakly prime, because it can be changed into another prime (37716541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18858260 + 18858261.

It is an arithmetic number, because the mean of its divisors is an integer number (18858261).

Almost surely, 2^37716521 is an apocalyptic number.

It is an amenable number.

37716521 is a deficient number, since it is larger than the sum of its proper divisors (1).

37716521 is an equidigital number, since it uses as much as digits as its factorization.

37716521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 32.

The square root of 37716521 is about 6141.3777770139. The cubic root of 37716521 is about 335.3594448858.

The spelling of 37716521 in words is "thirty-seven million, seven hundred sixteen thousand, five hundred twenty-one".