131291897 has 12 divisors (see below), whose sum is σ = 144749220. Its totient is φ = 118995360.

The previous prime is 131291879. The next prime is 131291899. The reversal of 131291897 is 798192131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 94556176 + 36735721 = 9724^2 + 6061^2 .

It is not a de Polignac number, because 131291897 - 2¹⁸ = 131029753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131291899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43679 + ... + 46587.

It is an arithmetic number, because the mean of its divisors is an integer number (12062435).

Almost surely, 2^131291897 is an apocalyptic number.

It is an amenable number.

131291897 is a deficient number, since it is larger than the sum of its proper divisors (13457323).

131291897 is a wasteful number, since it uses less digits than its factorization.

131291897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304 (or 3293 counting only the distinct ones).

The product of its digits is 27216, while the sum is 41.

The square root of 131291897 is about 11458.2676264783. The cubic root of 131291897 is about 508.2522475221.

The spelling of 131291897 in words is "one hundred thirty-one million, two hundred ninety-one thousand, eight hundred ninety-seven".