99618913 has 2 divisors, whose sum is σ = 99618914. Its totient is φ = 99618912.

The previous prime is 99618899. The next prime is 99618931. The reversal of 99618913 is 31981699.

Together with next prime (99618931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75481344 + 24137569 = 8688^2 + 4913^2 .

It is a cyclic number.

It is not a de Polignac number, because 99618913 - 2¹⁷ = 99487841 is a prime.

It is not a weakly prime, because it can be changed into another prime (99618413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49809456 + 49809457.

It is an arithmetic number, because the mean of its divisors is an integer number (49809457).

Almost surely, 2^99618913 is an apocalyptic number.

It is an amenable number.

99618913 is a deficient number, since it is larger than the sum of its proper divisors (1).

99618913 is an equidigital number, since it uses as much as digits as its factorization.

99618913 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 99618913 is about 9980.9274619145. The cubic root of 99618913 is about 463.5685163998.

The spelling of 99618913 in words is "ninety-nine million, six hundred eighteen thousand, nine hundred thirteen".