97409721 has 4 divisors (see below), whose sum is σ = 129879632. Its totient is φ = 64939812.

The previous prime is 97409701. The next prime is 97409723. The reversal of 97409721 is 12790479.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 97409721 - 2⁷ = 97409593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97409721.

It is not an unprimeable number, because it can be changed into a prime (97409723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16234951 + ... + 16234956.

It is an arithmetic number, because the mean of its divisors is an integer number (32469908).

Almost surely, 2^97409721 is an apocalyptic number.

It is an amenable number.

97409721 is a deficient number, since it is larger than the sum of its proper divisors (32469911).

97409721 is a wasteful number, since it uses less digits than its factorization.

97409721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32469910.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 97409721 is about 9869.6363154880. The cubic root of 97409721 is about 460.1161033334.

The spelling of 97409721 in words is "ninety-seven million, four hundred nine thousand, seven hundred twenty-one".