97099991 has 2 divisors, whose sum is σ = 97099992. Its totient is φ = 97099990.

The previous prime is 97099973. The next prime is 97099993. The reversal of 97099991 is 19999079.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97099991 is a prime.

It is a Sophie Germain prime.

Together with 97099993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97099993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48549995 + 48549996.

It is an arithmetic number, because the mean of its divisors is an integer number (48549996).

Almost surely, 2^97099991 is an apocalyptic number.

97099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

97099991 is an equidigital number, since it uses as much as digits as its factorization.

97099991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 97099991 is about 9853.9327681896. The cubic root of 97099991 is about 459.6279142936.

The spelling of 97099991 in words is "ninety-seven million, ninety-nine thousand, nine hundred ninety-one".