99990257 has 4 divisors (see below), whose sum is σ = 100040256. Its totient is φ = 99940260.

The previous prime is 99990239. The next prime is 99990263. The reversal of 99990257 is 75209999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99990257 - 2⁸ = 99990001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99990287) 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, 21869 + ... + 26042.

It is an arithmetic number, because the mean of its divisors is an integer number (25010064).

Almost surely, 2^99990257 is an apocalyptic number.

It is an amenable number.

99990257 is a deficient number, since it is larger than the sum of its proper divisors (49999).

99990257 is a wasteful number, since it uses less digits than its factorization.

99990257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49998.

The product of its (nonzero) digits is 459270, while the sum is 50.

The square root of 99990257 is about 9999.5128381337. The cubic root of 99990257 is about 464.1438085384.

The spelling of 99990257 in words is "ninety-nine million, nine hundred ninety thousand, two hundred fifty-seven".