141231991 has 2 divisors, whose sum is σ = 141231992. Its totient is φ = 141231990.

The previous prime is 141231989. The next prime is 141232027. The reversal of 141231991 is 199132141.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 141231991 - 2¹ = 141231989 is a prime.

Together with 141231989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (141231901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70615995 + 70615996.

It is an arithmetic number, because the mean of its divisors is an integer number (70615996).

Almost surely, 2^141231991 is an apocalyptic number.

141231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

141231991 is an equidigital number, since it uses as much as digits as its factorization.

141231991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The square root of 141231991 is about 11884.1066555295. The cubic root of 141231991 is about 520.7680845892.

The spelling of 141231991 in words is "one hundred forty-one million, two hundred thirty-one thousand, nine hundred ninety-one".