99918311 has 4 divisors (see below), whose sum is σ = 103363800. Its totient is φ = 96472824.

The previous prime is 99918293. The next prime is 99918323. The reversal of 99918311 is 11381999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11381999 = 443 ⋅25693.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99918311 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 (99915311) 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, 1722701 + ... + 1722758.

It is an arithmetic number, because the mean of its divisors is an integer number (25840950).

Almost surely, 2^99918311 is an apocalyptic number.

99918311 is a deficient number, since it is larger than the sum of its proper divisors (3445489).

99918311 is a wasteful number, since it uses less digits than its factorization.

99918311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445488.

The product of its digits is 17496, while the sum is 41.

The square root of 99918311 is about 9995.9147155225. The cubic root of 99918311 is about 464.0324600136.

The spelling of 99918311 in words is "ninety-nine million, nine hundred eighteen thousand, three hundred eleven".