99812551 has 2 divisors, whose sum is σ = 99812552. Its totient is φ = 99812550.

The previous prime is 99812539. The next prime is 99812579. The reversal of 99812551 is 15521899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99812551 - 2⁹ = 99812039 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99810551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49906275 + 49906276.

It is an arithmetic number, because the mean of its divisors is an integer number (49906276).

Almost surely, 2^99812551 is an apocalyptic number.

99812551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99812551 is an equidigital number, since it uses as much as digits as its factorization.

99812551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 40.

The square root of 99812551 is about 9990.6231537377. The cubic root of 99812551 is about 463.8686815638.

The spelling of 99812551 in words is "ninety-nine million, eight hundred twelve thousand, five hundred fifty-one".