97980891 has 16 divisors (see below), whose sum is σ = 137788800. Its totient is φ = 61760448.

The previous prime is 97980859. The next prime is 97980907. The reversal of 97980891 is 19808979.

It is not a de Polignac number, because 97980891 - 2⁵ = 97980859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97980811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33895 + ... + 36671.

It is an arithmetic number, because the mean of its divisors is an integer number (8611800).

Almost surely, 2^97980891 is an apocalyptic number.

97980891 is a deficient number, since it is larger than the sum of its proper divisors (39807909).

97980891 is a wasteful number, since it uses less digits than its factorization.

97980891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 97980891 is about 9898.5297393098. The cubic root of 97980891 is about 461.0136609902.

The spelling of 97980891 in words is "ninety-seven million, nine hundred eighty thousand, eight hundred ninety-one".