97621921 has 2 divisors, whose sum is σ = 97621922. Its totient is φ = 97621920.

The previous prime is 97621907. The next prime is 97621957. The reversal of 97621921 is 12912679.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61152400 + 36469521 = 7820^2 + 6039^2 .

It is a cyclic number.

It is not a de Polignac number, because 97621921 - 2⁵ = 97621889 is a prime.

It is not a weakly prime, because it can be changed into another prime (97621991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48810960 + 48810961.

It is an arithmetic number, because the mean of its divisors is an integer number (48810961).

Almost surely, 2^97621921 is an apocalyptic number.

It is an amenable number.

97621921 is a deficient number, since it is larger than the sum of its proper divisors (1).

97621921 is an equidigital number, since it uses as much as digits as its factorization.

97621921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 97621921 is about 9880.3806100777. The cubic root of 97621921 is about 460.4499708492.

The spelling of 97621921 in words is "ninety-seven million, six hundred twenty-one thousand, nine hundred twenty-one".