97173721 has 2 divisors, whose sum is σ = 97173722. Its totient is φ = 97173720.

The previous prime is 97173719. The next prime is 97173779. The reversal of 97173721 is 12737179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96432400 + 741321 = 9820^2 + 861^2 .

It is a cyclic number.

It is not a de Polignac number, because 97173721 - 2¹ = 97173719 is a prime.

Together with 97173719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (97173701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48586860 + 48586861.

It is an arithmetic number, because the mean of its divisors is an integer number (48586861).

Almost surely, 2^97173721 is an apocalyptic number.

It is an amenable number.

97173721 is a deficient number, since it is larger than the sum of its proper divisors (1).

97173721 is an equidigital number, since it uses as much as digits as its factorization.

97173721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18522, while the sum is 37.

The square root of 97173721 is about 9857.6732041593. The cubic root of 97173721 is about 459.7442198051.

The spelling of 97173721 in words is "ninety-seven million, one hundred seventy-three thousand, seven hundred twenty-one".