99747251 has 4 divisors (see below), whose sum is σ = 104084112. Its totient is φ = 95410392.

The previous prime is 99747239. The next prime is 99747253. The reversal of 99747251 is 15274799.

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

It is a cyclic number.

It is not a de Polignac number, because 99747251 - 2⁶ = 99747187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99747253) 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, 2168396 + ... + 2168441.

It is an arithmetic number, because the mean of its divisors is an integer number (26021028).

Almost surely, 2^99747251 is an apocalyptic number.

99747251 is a deficient number, since it is larger than the sum of its proper divisors (4336861).

99747251 is a wasteful number, since it uses less digits than its factorization.

99747251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336860.

The product of its digits is 158760, while the sum is 44.

The square root of 99747251 is about 9987.3545546356. The cubic root of 99747251 is about 463.7675011256.

The spelling of 99747251 in words is "ninety-nine million, seven hundred forty-seven thousand, two hundred fifty-one".