231401999 has 2 divisors, whose sum is σ = 231402000. Its totient is φ = 231401998.

The previous prime is 231401927. The next prime is 231402013. The reversal of 231401999 is 999104132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231401999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231401699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115700999 + 115701000.

It is an arithmetic number, because the mean of its divisors is an integer number (115701000).

Almost surely, 2^231401999 is an apocalyptic number.

231401999 is a deficient number, since it is larger than the sum of its proper divisors (1).

231401999 is an equidigital number, since it uses as much as digits as its factorization.

231401999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 231401999 is about 15211.9032011120. The cubic root of 231401999 is about 613.9349658968.

The spelling of 231401999 in words is "two hundred thirty-one million, four hundred one thousand, nine hundred ninety-nine".