97891021 has 8 divisors (see below), whose sum is σ = 103798080. Its totient is φ = 92059488.

The previous prime is 97891009. The next prime is 97891051. The reversal of 97891021 is 12019879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97891021 - 2⁷ = 97890893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97891051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16201 + ... + 21406.

It is an arithmetic number, because the mean of its divisors is an integer number (12974760).

Almost surely, 2^97891021 is an apocalyptic number.

It is an amenable number.

97891021 is a deficient number, since it is larger than the sum of its proper divisors (5907059).

97891021 is a wasteful number, since it uses less digits than its factorization.

97891021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37763.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 97891021 is about 9893.9891348232. The cubic root of 97891021 is about 460.8726676089.

The spelling of 97891021 in words is "ninety-seven million, eight hundred ninety-one thousand, twenty-one".