97137188879021 has 2 divisors, whose sum is σ = 97137188879022. Its totient is φ = 97137188879020.

The previous prime is 97137188879011. The next prime is 97137188879039. The reversal of 97137188879021 is 12097888173179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92251011258121 + 4886177620900 = 9604739^2 + 2210470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97137188879021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97137188879011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48568594439510 + 48568594439511.

It is an arithmetic number, because the mean of its divisors is an integer number (48568594439511).

Almost surely, 2^{97137188879021} is an apocalyptic number.

It is an amenable number.

97137188879021 is a deficient number, since it is larger than the sum of its proper divisors (1).

97137188879021 is an equidigital number, since it uses as much as digits as its factorization.

97137188879021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85349376, while the sum is 71.

The spelling of 97137188879021 in words is "ninety-seven trillion, one hundred thirty-seven billion, one hundred eighty-eight million, eight hundred seventy-nine thousand, twenty-one".