97415721 has 12 divisors (see below), whose sum is σ = 151535748. Its totient is φ = 59948064.

The previous prime is 97415711. The next prime is 97415743. The reversal of 97415721 is 12751479.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11594025 + 85821696 = 3405^2 + 9264^2 .

It is not a de Polignac number, because 97415721 - 2¹³ = 97407529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97415711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 416190 + ... + 416423.

It is an arithmetic number, because the mean of its divisors is an integer number (12627979).

Almost surely, 2^97415721 is an apocalyptic number.

It is an amenable number.

97415721 is a deficient number, since it is larger than the sum of its proper divisors (54120027).

97415721 is a wasteful number, since it uses less digits than its factorization.

97415721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832632 (or 832629 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 97415721 is about 9869.9402733755. The cubic root of 97415721 is about 460.1255501659.

The spelling of 97415721 in words is "ninety-seven million, four hundred fifteen thousand, seven hundred twenty-one".