232501991 has 2 divisors, whose sum is σ = 232501992. Its totient is φ = 232501990.

The previous prime is 232501987. The next prime is 232502027. The reversal of 232501991 is 199105232.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 232501991 - 2² = 232501987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232507991) 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, 116250995 + 116250996.

It is an arithmetic number, because the mean of its divisors is an integer number (116250996).

Almost surely, 2^232501991 is an apocalyptic number.

232501991 is a deficient number, since it is larger than the sum of its proper divisors (1).

232501991 is an equidigital number, since it uses as much as digits as its factorization.

232501991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 232501991 is about 15248.0159692991. The cubic root of 232501991 is about 614.9062284597.

The spelling of 232501991 in words is "two hundred thirty-two million, five hundred one thousand, nine hundred ninety-one".