131689791 has 6 divisors (see below), whose sum is σ = 190218600. Its totient is φ = 87793188.

The previous prime is 131689787. The next prime is 131689793. The reversal of 131689791 is 197986131.

It is not a de Polignac number, because 131689791 - 2² = 131689787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131689793) 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 in 5 ways as a sum of consecutive naturals, for example, 7316091 + ... + 7316108.

It is an arithmetic number, because the mean of its divisors is an integer number (31703100).

Almost surely, 2^131689791 is an apocalyptic number.

131689791 is a deficient number, since it is larger than the sum of its proper divisors (58528809).

131689791 is a wasteful number, since it uses less digits than its factorization.

131689791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14632205 (or 14632202 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 131689791 is about 11475.6172383014. The cubic root of 131689791 is about 508.7651671411.

The spelling of 131689791 in words is "one hundred thirty-one million, six hundred eighty-nine thousand, seven hundred ninety-one".