97393721 has 4 divisors (see below), whose sum is σ = 97938000. Its totient is φ = 96849444.

The previous prime is 97393651. The next prime is 97393733. The reversal of 97393721 is 12739379.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12739379 = 1697 ⋅7507.

It is a cyclic number.

It is not a de Polignac number, because 97393721 - 2¹⁸ = 97131577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97393781) 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, 271871 + ... + 272228.

It is an arithmetic number, because the mean of its divisors is an integer number (24484500).

Almost surely, 2^97393721 is an apocalyptic number.

It is an amenable number.

97393721 is a deficient number, since it is larger than the sum of its proper divisors (544279).

97393721 is a wasteful number, since it uses less digits than its factorization.

97393721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544278.

The product of its digits is 71442, while the sum is 41.

The square root of 97393721 is about 9868.8257153524. The cubic root of 97393721 is about 460.0909098836.

The spelling of 97393721 in words is "ninety-seven million, three hundred ninety-three thousand, seven hundred twenty-one".