37636981 has 2 divisors, whose sum is σ = 37636982. Its totient is φ = 37636980.

The previous prime is 37636913. The next prime is 37636999. The reversal of 37636981 is 18963673.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37625956 + 11025 = 6134^2 + 105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37636981 is a prime.

It is a super-2 number, since 2×37636981² = 2833084677588722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37636381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18818490 + 18818491.

It is an arithmetic number, because the mean of its divisors is an integer number (18818491).

Almost surely, 2^37636981 is an apocalyptic number.

It is an amenable number.

37636981 is a deficient number, since it is larger than the sum of its proper divisors (1).

37636981 is an equidigital number, since it uses as much as digits as its factorization.

37636981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 37636981 is about 6134.8986136692. The cubic root of 37636981 is about 335.1235335599.

The spelling of 37636981 in words is "thirty-seven million, six hundred thirty-six thousand, nine hundred eighty-one".