131291437 has 2 divisors, whose sum is σ = 131291438. Its totient is φ = 131291436.

The previous prime is 131291399. The next prime is 131291453. The reversal of 131291437 is 734192131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102839881 + 28451556 = 10141^2 + 5334^2 .

It is a cyclic number.

It is not a de Polignac number, because 131291437 - 2¹⁹ = 130767149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131291399 and 131291408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131291137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65645718 + 65645719.

It is an arithmetic number, because the mean of its divisors is an integer number (65645719).

Almost surely, 2^131291437 is an apocalyptic number.

It is an amenable number.

131291437 is a deficient number, since it is larger than the sum of its proper divisors (1).

131291437 is an equidigital number, since it uses as much as digits as its factorization.

131291437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 131291437 is about 11458.2475536183. The cubic root of 131291437 is about 508.2516539432.

The spelling of 131291437 in words is "one hundred thirty-one million, two hundred ninety-one thousand, four hundred thirty-seven".