97138813 has 2 divisors, whose sum is σ = 97138814. Its totient is φ = 97138812.

The previous prime is 97138781. The next prime is 97138829. The reversal of 97138813 is 31883179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87572164 + 9566649 = 9358^2 + 3093^2 .

It is a cyclic number.

It is not a de Polignac number, because 97138813 - 2⁵ = 97138781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97138843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48569406 + 48569407.

It is an arithmetic number, because the mean of its divisors is an integer number (48569407).

Almost surely, 2^97138813 is an apocalyptic number.

It is an amenable number.

97138813 is a deficient number, since it is larger than the sum of its proper divisors (1).

97138813 is an equidigital number, since it uses as much as digits as its factorization.

97138813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 97138813 is about 9855.9024447282. The cubic root of 97138813 is about 459.6891614581.

The spelling of 97138813 in words is "ninety-seven million, one hundred thirty-eight thousand, eight hundred thirteen".