131649797 has 4 divisors (see below), whose sum is σ = 131925120. Its totient is φ = 131374476.

The previous prime is 131649743. The next prime is 131649799. The reversal of 131649797 is 797946131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131649797 - 2²⁰ = 130601221 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 (131649799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136943 + ... + 137900.

It is an arithmetic number, because the mean of its divisors is an integer number (32981280).

Almost surely, 2^131649797 is an apocalyptic number.

It is an amenable number.

131649797 is a deficient number, since it is larger than the sum of its proper divisors (275323).

131649797 is an equidigital number, since it uses as much as digits as its factorization.

131649797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275322.

The product of its digits is 285768, while the sum is 47.

The square root of 131649797 is about 11473.8745417579. The cubic root of 131649797 is about 508.7136581767.

The spelling of 131649797 in words is "one hundred thirty-one million, six hundred forty-nine thousand, seven hundred ninety-seven".