131511871 has 2 divisors, whose sum is σ = 131511872. Its totient is φ = 131511870.

The previous prime is 131511851. The next prime is 131511883. The reversal of 131511871 is 178115131.

It is a strong prime.

It is an emirp because it is prime and its reverse (178115131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131511871 - 2²⁵ = 97957439 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131511841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65755935 + 65755936.

It is an arithmetic number, because the mean of its divisors is an integer number (65755936).

Almost surely, 2^131511871 is an apocalyptic number.

131511871 is a deficient number, since it is larger than the sum of its proper divisors (1).

131511871 is an equidigital number, since it uses as much as digits as its factorization.

131511871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 28.

The square root of 131511871 is about 11467.8625296958. The cubic root of 131511871 is about 508.5359408307.

The spelling of 131511871 in words is "one hundred thirty-one million, five hundred eleven thousand, eight hundred seventy-one".