99997311 has 4 divisors (see below), whose sum is σ = 133329752. Its totient is φ = 66664872.

The previous prime is 99997267. The next prime is 99997357. The reversal of 99997311 is 11379999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11379999 = 3 ⋅3793333.

It is not a de Polignac number, because 99997311 - 2¹⁰ = 99996287 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997411) 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, 16666216 + ... + 16666221.

It is an arithmetic number, because the mean of its divisors is an integer number (33332438).

Almost surely, 2^99997311 is an apocalyptic number.

99997311 is a deficient number, since it is larger than the sum of its proper divisors (33332441).

99997311 is a wasteful number, since it uses less digits than its factorization.

99997311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33332440.

The product of its digits is 137781, while the sum is 48.

The square root of 99997311 is about 9999.8655490961. The cubic root of 99997311 is about 464.1547229132.

It can be divided in two parts, 99 and 997311, that multiplied together give a palindrome (98733789).

The spelling of 99997311 in words is "ninety-nine million, nine hundred ninety-seven thousand, three hundred eleven".