99857951 has 2 divisors, whose sum is σ = 99857952. Its totient is φ = 99857950.

The previous prime is 99857929. The next prime is 99857957. The reversal of 99857951 is 15975899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99857951 - 2⁶ = 99857887 is a prime.

It is a super-2 number, since 2×99857951² = 19943220755836802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99857893 and 99857902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99857957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49928975 + 49928976.

It is an arithmetic number, because the mean of its divisors is an integer number (49928976).

Almost surely, 2^99857951 is an apocalyptic number.

99857951 is a deficient number, since it is larger than the sum of its proper divisors (1).

99857951 is an equidigital number, since it uses as much as digits as its factorization.

99857951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 53.

The square root of 99857951 is about 9992.8950259672. The cubic root of 99857951 is about 463.9390015310.

The spelling of 99857951 in words is "ninety-nine million, eight hundred fifty-seven thousand, nine hundred fifty-one".