97721899 has 12 divisors (see below), whose sum is σ = 113734152. Its totient is φ = 83610560.

The previous prime is 97721893. The next prime is 97721927. The reversal of 97721899 is 99812779.

It is not a de Polignac number, because 97721899 - 2³ = 97721891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97721891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21697 + ... + 25810.

It is an arithmetic number, because the mean of its divisors is an integer number (9477846).

Almost surely, 2^97721899 is an apocalyptic number.

97721899 is a deficient number, since it is larger than the sum of its proper divisors (16012253).

97721899 is a wasteful number, since it uses less digits than its factorization.

97721899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47546 (or 47535 counting only the distinct ones).

The product of its digits is 571536, while the sum is 52.

The square root of 97721899 is about 9885.4387358377. The cubic root of 97721899 is about 460.6071048220.

The spelling of 97721899 in words is "ninety-seven million, seven hundred twenty-one thousand, eight hundred ninety-nine".