99427891 has 2 divisors, whose sum is σ = 99427892. Its totient is φ = 99427890.

The previous prime is 99427871. The next prime is 99427897. The reversal of 99427891 is 19872499.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99427891 - 2⁹ = 99427379 is a prime.

It is not a weakly prime, because it can be changed into another prime (99427897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49713945 + 49713946.

It is an arithmetic number, because the mean of its divisors is an integer number (49713946).

Almost surely, 2^99427891 is an apocalyptic number.

99427891 is a deficient number, since it is larger than the sum of its proper divisors (1).

99427891 is an equidigital number, since it uses as much as digits as its factorization.

99427891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 99427891 is about 9971.3535189562. The cubic root of 99427891 is about 463.2720250241.

The spelling of 99427891 in words is "ninety-nine million, four hundred twenty-seven thousand, eight hundred ninety-one".