99808251 has 16 divisors (see below), whose sum is σ = 138086400. Its totient is φ = 64056960.

The previous prime is 99808243. The next prime is 99808253. The reversal of 99808251 is 15280899.

It is a happy number.

It is not a de Polignac number, because 99808251 - 2³ = 99808243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99808253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15811 + ... + 21203.

It is an arithmetic number, because the mean of its divisors is an integer number (8630400).

Almost surely, 2^99808251 is an apocalyptic number.

99808251 is a deficient number, since it is larger than the sum of its proper divisors (38278149).

99808251 is a wasteful number, since it uses less digits than its factorization.

99808251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5626.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 99808251 is about 9990.4079496285. The cubic root of 99808251 is about 463.8620201972.

The spelling of 99808251 in words is "ninety-nine million, eight hundred eight thousand, two hundred fifty-one".