99997911 has 12 divisors (see below), whose sum is σ = 155552488. Its totient is φ = 61537104.

The previous prime is 99997907. The next prime is 99997913. The reversal of 99997911 is 11979999.

It is not a de Polignac number, because 99997911 - 2² = 99997907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997913) 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, 427225 + ... + 427458.

Almost surely, 2^99997911 is an apocalyptic number.

99997911 is a deficient number, since it is larger than the sum of its proper divisors (55554577).

99997911 is a wasteful number, since it uses less digits than its factorization.

99997911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854702 (or 854699 counting only the distinct ones).

The product of its digits is 413343, while the sum is 54.

The square root of 99997911 is about 9999.8955494545. The cubic root of 99997911 is about 464.1556512457.

The spelling of 99997911 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred eleven".