231431899 has 2 divisors, whose sum is σ = 231431900. Its totient is φ = 231431898.

The previous prime is 231431831. The next prime is 231431917. The reversal of 231431899 is 998134132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231431899 - 2¹³ = 231423707 is a prime.

It is not a weakly prime, because it can be changed into another prime (231435899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115715949 + 115715950.

It is an arithmetic number, because the mean of its divisors is an integer number (115715950).

Almost surely, 2^231431899 is an apocalyptic number.

231431899 is a deficient number, since it is larger than the sum of its proper divisors (1).

231431899 is an equidigital number, since it uses as much as digits as its factorization.

231431899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 231431899 is about 15212.8859523760. The cubic root of 231431899 is about 613.9614074213.

The spelling of 231431899 in words is "two hundred thirty-one million, four hundred thirty-one thousand, eight hundred ninety-nine".