37081021 has 2 divisors, whose sum is σ = 37081022. Its totient is φ = 37081020.

The previous prime is 37081019. The next prime is 37081061. The reversal of 37081021 is 12018073.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22905796 + 14175225 = 4786^2 + 3765^2 .

It is a cyclic number.

It is not a de Polignac number, because 37081021 - 2¹ = 37081019 is a prime.

Together with 37081019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 37080983 and 37081001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37081061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18540510 + 18540511.

It is an arithmetic number, because the mean of its divisors is an integer number (18540511).

Almost surely, 2^37081021 is an apocalyptic number.

It is an amenable number.

37081021 is a deficient number, since it is larger than the sum of its proper divisors (1).

37081021 is an equidigital number, since it uses as much as digits as its factorization.

37081021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 37081021 is about 6089.4187735777. The cubic root of 37081021 is about 333.4652330228.

Adding to 37081021 its reverse (12018073), we get a palindrome (49099094).

The spelling of 37081021 in words is "thirty-seven million, eighty-one thousand, twenty-one".