99277991 has 4 divisors (see below), whose sum is σ = 102701400. Its totient is φ = 95854584.

The previous prime is 99277979. The next prime is 99278033. The reversal of 99277991 is 19977299.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99277991 - 2¹⁰ = 99276967 is a prime.

It is a super-2 number, since 2×99277991² = 19712238993992162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99277901) 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 3 ways as a sum of consecutive naturals, for example, 1711661 + ... + 1711718.

It is an arithmetic number, because the mean of its divisors is an integer number (25675350).

Almost surely, 2^99277991 is an apocalyptic number.

99277991 is a deficient number, since it is larger than the sum of its proper divisors (3423409).

99277991 is a wasteful number, since it uses less digits than its factorization.

99277991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423408.

The product of its digits is 642978, while the sum is 53.

The square root of 99277991 is about 9963.8341515704. The cubic root of 99277991 is about 463.0390943918.

The spelling of 99277991 in words is "ninety-nine million, two hundred seventy-seven thousand, nine hundred ninety-one".