97391971 has 2 divisors, whose sum is σ = 97391972. Its totient is φ = 97391970.

The previous prime is 97391953. The next prime is 97391981. The reversal of 97391971 is 17919379.

It is a strong prime.

It is an emirp because it is prime and its reverse (17919379) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97391971 - 2⁷ = 97391843 is a prime.

It is not a weakly prime, because it can be changed into another prime (97391981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48695985 + 48695986.

It is an arithmetic number, because the mean of its divisors is an integer number (48695986).

Almost surely, 2^97391971 is an apocalyptic number.

97391971 is a deficient number, since it is larger than the sum of its proper divisors (1).

97391971 is an equidigital number, since it uses as much as digits as its factorization.

97391971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107163, while the sum is 46.

The square root of 97391971 is about 9868.7370519231. The cubic root of 97391971 is about 460.0881541826.

The spelling of 97391971 in words is "ninety-seven million, three hundred ninety-one thousand, nine hundred seventy-one".