97291591 has 2 divisors, whose sum is σ = 97291592. Its totient is φ = 97291590.

The previous prime is 97291489. The next prime is 97291613. The reversal of 97291591 is 19519279.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97291591 - 2²¹ = 95194439 is a prime.

It is a super-2 number, since 2×97291591² = 18931307358622562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97291891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48645795 + 48645796.

It is an arithmetic number, because the mean of its divisors is an integer number (48645796).

Almost surely, 2^97291591 is an apocalyptic number.

97291591 is a deficient number, since it is larger than the sum of its proper divisors (1).

97291591 is an equidigital number, since it uses as much as digits as its factorization.

97291591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 43.

The square root of 97291591 is about 9863.6499836521. The cubic root of 97291591 is about 459.9300318912.

The spelling of 97291591 in words is "ninety-seven million, two hundred ninety-one thousand, five hundred ninety-one".