99618931 has 2 divisors, whose sum is σ = 99618932. Its totient is φ = 99618930.

The previous prime is 99618913. The next prime is 99618941. The reversal of 99618931 is 13981699.

Together with previous prime (99618913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99618931 - 2⁵ = 99618899 is a prime.

It is a super-2 number, since 2×99618931² = 19847862827165522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99618941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49809465 + 49809466.

It is an arithmetic number, because the mean of its divisors is an integer number (49809466).

Almost surely, 2^99618931 is an apocalyptic number.

99618931 is a deficient number, since it is larger than the sum of its proper divisors (1).

99618931 is an equidigital number, since it uses as much as digits as its factorization.

99618931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 46.

The square root of 99618931 is about 9980.9283636343. The cubic root of 99618931 is about 463.5685443203.

The spelling of 99618931 in words is "ninety-nine million, six hundred eighteen thousand, nine hundred thirty-one".