99620251 has 4 divisors (see below), whose sum is σ = 99737352. Its totient is φ = 99503152.

The previous prime is 99620237. The next prime is 99620263. The reversal of 99620251 is 15202699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15202699 = 29 ⋅524231.

It is a cyclic number.

It is not a de Polignac number, because 99620251 - 2¹³ = 99612059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99620351) 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, 57265 + ... + 58978.

It is an arithmetic number, because the mean of its divisors is an integer number (24934338).

Almost surely, 2^99620251 is an apocalyptic number.

99620251 is a deficient number, since it is larger than the sum of its proper divisors (117101).

99620251 is a wasteful number, since it uses less digits than its factorization.

99620251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117100.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 99620251 is about 9980.9944895286. The cubic root of 99620251 is about 463.5705918152.

The spelling of 99620251 in words is "ninety-nine million, six hundred twenty thousand, two hundred fifty-one".