99972287 has 2 divisors, whose sum is σ = 99972288. Its totient is φ = 99972286.

The previous prime is 99972269. The next prime is 99972289. The reversal of 99972287 is 78227999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99972287 is a prime.

Together with 99972289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99972289) 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 as a sum of consecutive naturals, namely, 49986143 + 49986144.

It is an arithmetic number, because the mean of its divisors is an integer number (49986144).

Almost surely, 2^99972287 is an apocalyptic number.

99972287 is a deficient number, since it is larger than the sum of its proper divisors (1).

99972287 is an equidigital number, since it uses as much as digits as its factorization.

99972287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The square root of 99972287 is about 9998.6142539854. The cubic root of 99972287 is about 464.1160019493.

The spelling of 99972287 in words is "ninety-nine million, nine hundred seventy-two thousand, two hundred eighty-seven".