97407991 has 2 divisors, whose sum is σ = 97407992. Its totient is φ = 97407990.

The previous prime is 97407949. The next prime is 97408009. The reversal of 97407991 is 19970479.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97407991 - 2¹⁷ = 97276919 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 (97407931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48703995 + 48703996.

It is an arithmetic number, because the mean of its divisors is an integer number (48703996).

Almost surely, 2^97407991 is an apocalyptic number.

97407991 is a deficient number, since it is larger than the sum of its proper divisors (1).

97407991 is an equidigital number, since it uses as much as digits as its factorization.

97407991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 97407991 is about 9869.5486725584. The cubic root of 97407991 is about 460.1133794247.

The spelling of 97407991 in words is "ninety-seven million, four hundred seven thousand, nine hundred ninety-one".