97517921 has 2 divisors, whose sum is σ = 97517922. Its totient is φ = 97517920.

The previous prime is 97517911. The next prime is 97517939. The reversal of 97517921 is 12971579.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78499600 + 19018321 = 8860^2 + 4361^2 .

It is a cyclic number.

It is not a de Polignac number, because 97517921 - 2⁶ = 97517857 is a prime.

It is not a weakly prime, because it can be changed into another prime (97517911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48758960 + 48758961.

It is an arithmetic number, because the mean of its divisors is an integer number (48758961).

Almost surely, 2^97517921 is an apocalyptic number.

It is an amenable number.

97517921 is a deficient number, since it is larger than the sum of its proper divisors (1).

97517921 is an equidigital number, since it uses as much as digits as its factorization.

97517921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 41.

The square root of 97517921 is about 9875.1162524803. The cubic root of 97517921 is about 460.2864016710.

The spelling of 97517921 in words is "ninety-seven million, five hundred seventeen thousand, nine hundred twenty-one".