99427831 has 2 divisors, whose sum is σ = 99427832. Its totient is φ = 99427830.

The previous prime is 99427777. The next prime is 99427837. The reversal of 99427831 is 13872499.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99427831 - 2⁹ = 99427319 is a prime.

It is a super-2 number, since 2×99427831² = 19771787154729122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99427837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49713915 + 49713916.

It is an arithmetic number, because the mean of its divisors is an integer number (49713916).

Almost surely, 2^99427831 is an apocalyptic number.

99427831 is a deficient number, since it is larger than the sum of its proper divisors (1).

99427831 is an equidigital number, since it uses as much as digits as its factorization.

99427831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 99427831 is about 9971.3505103371. The cubic root of 99427831 is about 463.2719318366.

The spelling of 99427831 in words is "ninety-nine million, four hundred twenty-seven thousand, eight hundred thirty-one".