131524991 has 4 divisors (see below), whose sum is σ = 141642312. Its totient is φ = 121407672.

The previous prime is 131524979. The next prime is 131525041. The reversal of 131524991 is 199425131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131524991 - 2¹⁸ = 131262847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131524931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5058641 + ... + 5058666.

It is an arithmetic number, because the mean of its divisors is an integer number (35410578).

Almost surely, 2^131524991 is an apocalyptic number.

131524991 is a deficient number, since it is larger than the sum of its proper divisors (10117321).

131524991 is a wasteful number, since it uses less digits than its factorization.

131524991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10117320.

The product of its digits is 9720, while the sum is 35.

The square root of 131524991 is about 11468.4345487952. The cubic root of 131524991 is about 508.5528512679.

The spelling of 131524991 in words is "one hundred thirty-one million, five hundred twenty-four thousand, nine hundred ninety-one".