97719721 has 12 divisors (see below), whose sum is σ = 109702656. Its totient is φ = 86940920.

The previous prime is 97719707. The next prime is 97719731. The reversal of 97719721 is 12791779.

It is not a de Polignac number, because 97719721 - 2⁷ = 97719593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97719731) 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, 2905 + ... + 14278.

It is an arithmetic number, because the mean of its divisors is an integer number (9141888).

Almost surely, 2^97719721 is an apocalyptic number.

It is an amenable number.

97719721 is a deficient number, since it is larger than the sum of its proper divisors (11982935).

97719721 is a wasteful number, since it uses less digits than its factorization.

97719721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17252 (or 17241 counting only the distinct ones).

The product of its digits is 55566, while the sum is 43.

The square root of 97719721 is about 9885.3285731937. The cubic root of 97719721 is about 460.6036828332.

The spelling of 97719721 in words is "ninety-seven million, seven hundred nineteen thousand, seven hundred twenty-one".