97817939 has 2 divisors, whose sum is σ = 97817940. Its totient is φ = 97817938.

The previous prime is 97817921. The next prime is 97817959. The reversal of 97817939 is 93971879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97817939 - 2⁸ = 97817683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97817959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48908969 + 48908970.

It is an arithmetic number, because the mean of its divisors is an integer number (48908970).

Almost surely, 2^97817939 is an apocalyptic number.

97817939 is a deficient number, since it is larger than the sum of its proper divisors (1).

97817939 is an equidigital number, since it uses as much as digits as its factorization.

97817939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 53.

The square root of 97817939 is about 9890.2951927635. The cubic root of 97817939 is about 460.7579486039.

The spelling of 97817939 in words is "ninety-seven million, eight hundred seventeen thousand, nine hundred thirty-nine".