232011991 has 2 divisors, whose sum is σ = 232011992. Its totient is φ = 232011990.

The previous prime is 232011973. The next prime is 232012003. The reversal of 232011991 is 199110232.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 232011991 - 2⁵ = 232011959 is a prime.

It is a super-3 number, since 3×232011991³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232011191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116005995 + 116005996.

It is an arithmetic number, because the mean of its divisors is an integer number (116005996).

Almost surely, 2^232011991 is an apocalyptic number.

232011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

232011991 is an equidigital number, since it uses as much as digits as its factorization.

232011991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 232011991 is about 15231.9398305009. The cubic root of 232011991 is about 614.4739512051.

The spelling of 232011991 in words is "two hundred thirty-two million, eleven thousand, nine hundred ninety-one".