99216251 has 4 divisors (see below), whose sum is σ = 99268512. Its totient is φ = 99163992.

The previous prime is 99216241. The next prime is 99216253. The reversal of 99216251 is 15261299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15261299 = 79 ⋅193181.

It is a cyclic number.

It is not a de Polignac number, because 99216251 - 2¹⁰ = 99215227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99216253) 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, 23171 + ... + 27116.

It is an arithmetic number, because the mean of its divisors is an integer number (24817128).

Almost surely, 2^99216251 is an apocalyptic number.

99216251 is a deficient number, since it is larger than the sum of its proper divisors (52261).

99216251 is a wasteful number, since it uses less digits than its factorization.

99216251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52260.

The product of its digits is 9720, while the sum is 35.

The square root of 99216251 is about 9960.7354648138. The cubic root of 99216251 is about 462.9430880106.

The spelling of 99216251 in words is "ninety-nine million, two hundred sixteen thousand, two hundred fifty-one".