37640081 has 2 divisors, whose sum is σ = 37640082. Its totient is φ = 37640080.

The previous prime is 37640077. The next prime is 37640087. The reversal of 37640081 is 18004673.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27457600 + 10182481 = 5240^2 + 3191^2 .

It is an emirp because it is prime and its reverse (18004673) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37640081 - 2² = 37640077 is a prime.

It is a super-2 number, since 2×37640081² = 2833551395373122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (37640087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18820040 + 18820041.

It is an arithmetic number, because the mean of its divisors is an integer number (18820041).

Almost surely, 2^37640081 is an apocalyptic number.

It is an amenable number.

37640081 is a deficient number, since it is larger than the sum of its proper divisors (1).

37640081 is an equidigital number, since it uses as much as digits as its factorization.

37640081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 37640081 is about 6135.1512613790. The cubic root of 37640081 is about 335.1327342131.

The spelling of 37640081 in words is "thirty-seven million, six hundred forty thousand, eighty-one".