99209251 has 2 divisors, whose sum is σ = 99209252. Its totient is φ = 99209250.

The previous prime is 99209237. The next prime is 99209309. The reversal of 99209251 is 15290299.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99209251 - 2⁵ = 99209219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99209251.

It is not a weakly prime, because it can be changed into another prime (99209221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49604625 + 49604626.

It is an arithmetic number, because the mean of its divisors is an integer number (49604626).

Almost surely, 2^99209251 is an apocalyptic number.

99209251 is the 6300-th centered pentagonal number.

99209251 is a deficient number, since it is larger than the sum of its proper divisors (1).

99209251 is an equidigital number, since it uses as much as digits as its factorization.

99209251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 99209251 is about 9960.3840789399. The cubic root of 99209251 is about 462.9322004198.

The spelling of 99209251 in words is "ninety-nine million, two hundred nine thousand, two hundred fifty-one".