97569991 has 2 divisors, whose sum is σ = 97569992. Its totient is φ = 97569990.

The previous prime is 97569973. The next prime is 97570003. The reversal of 97569991 is 19996579.

It is a strong prime.

It is an emirp because it is prime and its reverse (19996579) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97569991 - 2²⁵ = 64015559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97569491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48784995 + 48784996.

It is an arithmetic number, because the mean of its divisors is an integer number (48784996).

Almost surely, 2^97569991 is an apocalyptic number.

97569991 is a deficient number, since it is larger than the sum of its proper divisors (1).

97569991 is an equidigital number, since it uses as much as digits as its factorization.

97569991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1377810, while the sum is 55.

The square root of 97569991 is about 9877.7523253015. The cubic root of 97569991 is about 460.3683108838.

The spelling of 97569991 in words is "ninety-seven million, five hundred sixty-nine thousand, nine hundred ninety-one".