131523869 has 16 divisors (see below), whose sum is σ = 136836480. Its totient is φ = 126360000.

The previous prime is 131523857. The next prime is 131523877. The reversal of 131523869 is 968325131.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131523869 is a prime.

It is a super-2 number, since 2×131523869² = 34597056233458322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131523809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 870944 + ... + 871094.

It is an arithmetic number, because the mean of its divisors is an integer number (8552280).

Almost surely, 2^131523869 is an apocalyptic number.

It is an amenable number.

131523869 is a deficient number, since it is larger than the sum of its proper divisors (5312611).

131523869 is a wasteful number, since it uses less digits than its factorization.

131523869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its digits is 38880, while the sum is 38.

The square root of 131523869 is about 11468.3856318141. The cubic root of 131523869 is about 508.5514051601.

The spelling of 131523869 in words is "one hundred thirty-one million, five hundred twenty-three thousand, eight hundred sixty-nine".