232231991 has 2 divisors, whose sum is σ = 232231992. Its totient is φ = 232231990.

The previous prime is 232231973. The next prime is 232231997. The reversal of 232231991 is 199132232.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-232231991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232231997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116115995 + 116115996.

It is an arithmetic number, because the mean of its divisors is an integer number (116115996).

Almost surely, 2^232231991 is an apocalyptic number.

232231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

232231991 is an equidigital number, since it uses as much as digits as its factorization.

232231991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 232231991 is about 15239.1597865499. The cubic root of 232231991 is about 614.6681100827.

The spelling of 232231991 in words is "two hundred thirty-two million, two hundred thirty-one thousand, nine hundred ninety-one".