97164721 has 2 divisors, whose sum is σ = 97164722. Its totient is φ = 97164720.

The previous prime is 97164713. The next prime is 97164731. The reversal of 97164721 is 12746179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94478400 + 2686321 = 9720^2 + 1639^2 .

It is an emirp because it is prime and its reverse (12746179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97164721 - 2³ = 97164713 is a prime.

It is not a weakly prime, because it can be changed into another prime (97164731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48582360 + 48582361.

It is an arithmetic number, because the mean of its divisors is an integer number (48582361).

Almost surely, 2^97164721 is an apocalyptic number.

It is an amenable number.

97164721 is a deficient number, since it is larger than the sum of its proper divisors (1).

97164721 is an equidigital number, since it uses as much as digits as its factorization.

97164721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 37.

The square root of 97164721 is about 9857.2166964108. The cubic root of 97164721 is about 459.7300258932.

The spelling of 97164721 in words is "ninety-seven million, one hundred sixty-four thousand, seven hundred twenty-one".