99915257 has 4 divisors (see below), whose sum is σ = 107601060. Its totient is φ = 92229456.

The previous prime is 99915223. The next prime is 99915259. The reversal of 99915257 is 75251999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7678441 + 92236816 = 2771^2 + 9604^2 .

It is a cyclic number.

It is not a de Polignac number, because 99915257 - 2¹⁰ = 99914233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99915259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3842882 + ... + 3842907.

It is an arithmetic number, because the mean of its divisors is an integer number (26900265).

Almost surely, 2^99915257 is an apocalyptic number.

It is an amenable number.

99915257 is a deficient number, since it is larger than the sum of its proper divisors (7685803).

99915257 is a wasteful number, since it uses less digits than its factorization.

99915257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7685802.

The product of its digits is 255150, while the sum is 47.

The square root of 99915257 is about 9995.7619519474. The cubic root of 99915257 is about 464.0277322530.

The spelling of 99915257 in words is "ninety-nine million, nine hundred fifteen thousand, two hundred fifty-seven".