97139993 has 2 divisors, whose sum is σ = 97139994. Its totient is φ = 97139992.

The previous prime is 97139927. The next prime is 97140041. The reversal of 97139993 is 39993179.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94731289 + 2408704 = 9733^2 + 1552^2 .

It is a cyclic number.

It is not a de Polignac number, because 97139993 - 2⁸ = 97139737 is a prime.

It is not a weakly prime, because it can be changed into another prime (97139293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48569996 + 48569997.

It is an arithmetic number, because the mean of its divisors is an integer number (48569997).

Almost surely, 2^97139993 is an apocalyptic number.

It is an amenable number.

97139993 is a deficient number, since it is larger than the sum of its proper divisors (1).

97139993 is an equidigital number, since it uses as much as digits as its factorization.

97139993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 413343, while the sum is 50.

The square root of 97139993 is about 9855.9623071520. The cubic root of 97139993 is about 459.6910228185.

The spelling of 97139993 in words is "ninety-seven million, one hundred thirty-nine thousand, nine hundred ninety-three".