97979999 has 8 divisors (see below), whose sum is σ = 106563072. Its totient is φ = 89546400.

The previous prime is 97979989. The next prime is 97980019. The reversal of 97979999 is 99997979.

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 97979999 - 2²⁰ = 96931423 is a prime.

It is a Duffinian number.

97979999 is a modest number, since divided by 9999 gives 9797 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97979909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35999 + ... + 38624.

It is an arithmetic number, because the mean of its divisors is an integer number (13320384).

Almost surely, 2^97979999 is an apocalyptic number.

97979999 is a deficient number, since it is larger than the sum of its proper divisors (8583073).

97979999 is a wasteful number, since it uses less digits than its factorization.

97979999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74737.

The product of its digits is 26040609, while the sum is 68.

The square root of 97979999 is about 9898.4846820107. The cubic root of 97979999 is about 461.0122619915.

The spelling of 97979999 in words is "ninety-seven million, nine hundred seventy-nine thousand, nine hundred ninety-nine".