131214991 has 2 divisors, whose sum is σ = 131214992. Its totient is φ = 131214990.

The previous prime is 131214989. The next prime is 131215009. The reversal of 131214991 is 199412131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131214991 - 2¹ = 131214989 is a prime.

Together with 131214989, 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 (131214911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65607495 + 65607496.

It is an arithmetic number, because the mean of its divisors is an integer number (65607496).

Almost surely, 2^131214991 is an apocalyptic number.

131214991 is a deficient number, since it is larger than the sum of its proper divisors (1).

131214991 is an equidigital number, since it uses as much as digits as its factorization.

131214991 is an evil number, because the sum of its binary digits is even.

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

The square root of 131214991 is about 11454.9112174648. The cubic root of 131214991 is about 508.1529896020.

The spelling of 131214991 in words is "one hundred thirty-one million, two hundred fourteen thousand, nine hundred ninety-one".