97979791 has 16 divisors (see below), whose sum is σ = 123536448. Its totient is φ = 75628800.

The previous prime is 97979771. The next prime is 97979801. The reversal of 97979791 is 19797979.

It is not a de Polignac number, because 97979791 - 2¹¹ = 97977743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97979771) 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, 9400 + ... + 16861.

It is an arithmetic number, because the mean of its divisors is an integer number (7721028).

Almost surely, 2^97979791 is an apocalyptic number.

97979791 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

97979791 is a deficient number, since it is larger than the sum of its proper divisors (25556657).

97979791 is a wasteful number, since it uses less digits than its factorization.

97979791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26322.

The product of its digits is 2250423, while the sum is 58.

The square root of 97979791 is about 9898.4741753464. The cubic root of 97979791 is about 461.0119357663.

The spelling of 97979791 in words is "ninety-seven million, nine hundred seventy-nine thousand, seven hundred ninety-one".