99638137 has 2 divisors, whose sum is σ = 99638138. Its totient is φ = 99638136.

The previous prime is 99638131. The next prime is 99638153. The reversal of 99638137 is 73183699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58920976 + 40717161 = 7676^2 + 6381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99638137 is a prime.

It is not a weakly prime, because it can be changed into another prime (99638131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49819068 + 49819069.

It is an arithmetic number, because the mean of its divisors is an integer number (49819069).

Almost surely, 2^99638137 is an apocalyptic number.

It is an amenable number.

99638137 is a deficient number, since it is larger than the sum of its proper divisors (1).

99638137 is an equidigital number, since it uses as much as digits as its factorization.

99638137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 99638137 is about 9981.8904522139. The cubic root of 99638137 is about 463.5983335891.

The spelling of 99638137 in words is "ninety-nine million, six hundred thirty-eight thousand, one hundred thirty-seven".