99918857 has 2 divisors, whose sum is σ = 99918858. Its totient is φ = 99918856.

The previous prime is 99918829. The next prime is 99918881. The reversal of 99918857 is 75881999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96746896 + 3171961 = 9836^2 + 1781^2 .

It is a cyclic number.

It is not a de Polignac number, because 99918857 - 2¹⁰ = 99917833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99918257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49959428 + 49959429.

It is an arithmetic number, because the mean of its divisors is an integer number (49959429).

Almost surely, 2^99918857 is an apocalyptic number.

It is an amenable number.

99918857 is a deficient number, since it is larger than the sum of its proper divisors (1).

99918857 is an equidigital number, since it uses as much as digits as its factorization.

99918857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 56.

The square root of 99918857 is about 9995.9420266426. The cubic root of 99918857 is about 464.0333052416.

The spelling of 99918857 in words is "ninety-nine million, nine hundred eighteen thousand, eight hundred fifty-seven".