99311987 has 8 divisors (see below), whose sum is σ = 102434112. Its totient is φ = 96232000.

The previous prime is 99311981. The next prime is 99312001. The reversal of 99311987 is 78911399.

It is a happy number.

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 99311987 - 2⁶ = 99311923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99311981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5714 + ... + 15207.

It is an arithmetic number, because the mean of its divisors is an integer number (12804264).

Almost surely, 2^99311987 is an apocalyptic number.

99311987 is a deficient number, since it is larger than the sum of its proper divisors (3122125).

99311987 is a wasteful number, since it uses less digits than its factorization.

99311987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21069.

The product of its digits is 122472, while the sum is 47.

The square root of 99311987 is about 9965.5399753350. The cubic root of 99311987 is about 463.0919415551.

The spelling of 99311987 in words is "ninety-nine million, three hundred eleven thousand, nine hundred eighty-seven".