97437506021 has 2 divisors, whose sum is σ = 97437506022. Its totient is φ = 97437506020.

The previous prime is 97437506009. The next prime is 97437506053. The reversal of 97437506021 is 12060573479.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77890669921 + 19546836100 = 279089^2 + 139810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97437506021 is a prime.

It is a super-2 number, since 2×97437506021² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97437506081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48718753010 + 48718753011.

It is an arithmetic number, because the mean of its divisors is an integer number (48718753011).

Almost surely, 2^97437506021 is an apocalyptic number.

It is an amenable number.

97437506021 is a deficient number, since it is larger than the sum of its proper divisors (1).

97437506021 is an equidigital number, since it uses as much as digits as its factorization.

97437506021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 97437506021 in words is "ninety-seven billion, four hundred thirty-seven million, five hundred six thousand, twenty-one".