99721277 has 4 divisors (see below), whose sum is σ = 99811200. Its totient is φ = 99631356.

The previous prime is 99721273. The next prime is 99721313. The reversal of 99721277 is 77212799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99721277 - 2² = 99721273 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99721273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43277 + ... + 45522.

It is an arithmetic number, because the mean of its divisors is an integer number (24952800).

Almost surely, 2^99721277 is an apocalyptic number.

It is an amenable number.

99721277 is a deficient number, since it is larger than the sum of its proper divisors (89923).

99721277 is a wasteful number, since it uses less digits than its factorization.

99721277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89922.

The product of its digits is 111132, while the sum is 44.

The square root of 99721277 is about 9986.0541256294. The cubic root of 99721277 is about 463.7272428973.

The spelling of 99721277 in words is "ninety-nine million, seven hundred twenty-one thousand, two hundred seventy-seven".