131509971 has 6 divisors (see below), whose sum is σ = 189958860. Its totient is φ = 87673308.

The previous prime is 131509949. The next prime is 131509993. The reversal of 131509971 is 179905131.

It is an interprime number because it is at equal distance from previous prime (131509949) and next prime (131509993).

It is not a de Polignac number, because 131509971 - 2¹⁰ = 131508947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131509921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7306101 + ... + 7306118.

It is an arithmetic number, because the mean of its divisors is an integer number (31659810).

Almost surely, 2^131509971 is an apocalyptic number.

131509971 is a deficient number, since it is larger than the sum of its proper divisors (58448889).

131509971 is a wasteful number, since it uses less digits than its factorization.

131509971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14612225 (or 14612222 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 36.

The square root of 131509971 is about 11467.7796891988. The cubic root of 131509971 is about 508.5334918175.

The spelling of 131509971 in words is "one hundred thirty-one million, five hundred nine thousand, nine hundred seventy-one".