37661513 has 2 divisors, whose sum is σ = 37661514. Its totient is φ = 37661512.

The previous prime is 37661509. The next prime is 37661531. The reversal of 37661513 is 31516673.

Together with next prime (37661531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36820624 + 840889 = 6068^2 + 917^2 .

It is a cyclic number.

It is not a de Polignac number, because 37661513 - 2² = 37661509 is a prime.

It is a super-2 number, since 2×37661513² = 2836779122898338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 37661513.

It is not a weakly prime, because it can be changed into another prime (37661543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18830756 + 18830757.

It is an arithmetic number, because the mean of its divisors is an integer number (18830757).

Almost surely, 2^37661513 is an apocalyptic number.

It is an amenable number.

37661513 is a deficient number, since it is larger than the sum of its proper divisors (1).

37661513 is an equidigital number, since it uses as much as digits as its factorization.

37661513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 37661513 is about 6136.8976690181. The cubic root of 37661513 is about 335.1963295594.

The spelling of 37661513 in words is "thirty-seven million, six hundred sixty-one thousand, five hundred thirteen".