99990251 has 4 divisors (see below), whose sum is σ = 100263072. Its totient is φ = 99717432.

The previous prime is 99990239. The next prime is 99990263. The reversal of 99990251 is 15209999.

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

It is an interprime number because it is at equal distance from previous prime (99990239) and next prime (99990263).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99990251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99990281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135860 + ... + 136593.

It is an arithmetic number, because the mean of its divisors is an integer number (25065768).

Almost surely, 2^99990251 is an apocalyptic number.

99990251 is a deficient number, since it is larger than the sum of its proper divisors (272821).

99990251 is a wasteful number, since it uses less digits than its factorization.

99990251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272820.

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 99990251 is about 9999.5125381190. The cubic root of 99990251 is about 464.1437992546.

The spelling of 99990251 in words is "ninety-nine million, nine hundred ninety thousand, two hundred fifty-one".