131320197 has 10 divisors (see below), whose sum is σ = 196169798. Its totient is φ = 87546744.

The previous prime is 131320187. The next prime is 131320219. The reversal of 131320197 is 791023131.

It can be written as a sum of positive squares in only one way, i.e., 76055841 + 55264356 = 8721^2 + 7434^2 .

It is not a de Polignac number, because 131320197 - 2⁷ = 131320069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131320197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131320187) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 810538 + ... + 810699.

Almost surely, 2^131320197 is an apocalyptic number.

It is an amenable number.

131320197 is a deficient number, since it is larger than the sum of its proper divisors (64849601).

131320197 is an equidigital number, since it uses as much as digits as its factorization.

131320197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621249 (or 1621240 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 131320197 is about 11459.5024761113. The cubic root of 131320197 is about 508.2887628634.

The spelling of 131320197 in words is "one hundred thirty-one million, three hundred twenty thousand, one hundred ninety-seven".