231330132991 has 2 divisors, whose sum is σ = 231330132992. Its totient is φ = 231330132990.

The previous prime is 231330132961. The next prime is 231330132997. The reversal of 231330132991 is 199231033132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231330132991 - 2⁷ = 231330132863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231330132991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231330132997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115665066495 + 115665066496.

It is an arithmetic number, because the mean of its divisors is an integer number (115665066496).

Almost surely, 2^231330132991 is an apocalyptic number.

231330132991 is a deficient number, since it is larger than the sum of its proper divisors (1).

231330132991 is an equidigital number, since it uses as much as digits as its factorization.

231330132991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 37.

The spelling of 231330132991 in words is "two hundred thirty-one billion, three hundred thirty million, one hundred thirty-two thousand, nine hundred ninety-one".