131491197 has 6 divisors (see below), whose sum is σ = 189931742. Its totient is φ = 87660792.

The previous prime is 131491187. The next prime is 131491201. The reversal of 131491197 is 791194131.

It can be written as a sum of positive squares in only one way, i.e., 67667076 + 63824121 = 8226^2 + 7989^2 .

It is not a de Polignac number, because 131491197 - 2¹⁶ = 131425661 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 (131491127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7305058 + ... + 7305075.

Almost surely, 2^131491197 is an apocalyptic number.

It is an amenable number.

131491197 is a deficient number, since it is larger than the sum of its proper divisors (58440545).

131491197 is a wasteful number, since it uses less digits than its factorization.

131491197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14610139 (or 14610136 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 131491197 is about 11466.9611057158. The cubic root of 131491197 is about 508.5092917206.

The spelling of 131491197 in words is "one hundred thirty-one million, four hundred ninety-one thousand, one hundred ninety-seven".