97117721 has 4 divisors (see below), whose sum is σ = 102229200. Its totient is φ = 92006244.

The previous prime is 97117697. The next prime is 97117733. The reversal of 97117721 is 12771179.

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 a cyclic number.

It is not a de Polignac number, because 97117721 - 2²² = 92923417 is a prime.

It is a super-3 number, since 3×97117721³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97117121) 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, 2555711 + ... + 2555748.

It is an arithmetic number, because the mean of its divisors is an integer number (25557300).

Almost surely, 2^97117721 is an apocalyptic number.

It is an amenable number.

97117721 is a deficient number, since it is larger than the sum of its proper divisors (5111479).

97117721 is a wasteful number, since it uses less digits than its factorization.

97117721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111478.

The product of its digits is 6174, while the sum is 35.

The square root of 97117721 is about 9854.8323679300. The cubic root of 97117721 is about 459.6558878869.

The spelling of 97117721 in words is "ninety-seven million, one hundred seventeen thousand, seven hundred twenty-one".