131945491 has 4 divisors (see below), whose sum is σ = 133251984. Its totient is φ = 130639000.

The previous prime is 131945479. The next prime is 131945521. The reversal of 131945491 is 194549131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194549131 = 7 ⋅27792733.

It is a cyclic number.

It is not a de Polignac number, because 131945491 - 2⁵ = 131945459 is a prime.

It is a super-2 number, since 2×131945491² = 34819225190462162, which contains 22 as substring.

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 131945491.

It is not an unprimeable number, because it can be changed into a prime (131945791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653095 + ... + 653296.

It is an arithmetic number, because the mean of its divisors is an integer number (33312996).

Almost surely, 2^131945491 is an apocalyptic number.

131945491 is a deficient number, since it is larger than the sum of its proper divisors (1306493).

131945491 is a wasteful number, since it uses less digits than its factorization.

131945491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306492.

The product of its digits is 19440, while the sum is 37.

The square root of 131945491 is about 11486.7528483902. The cubic root of 131945491 is about 509.0942413598.

The spelling of 131945491 in words is "one hundred thirty-one million, nine hundred forty-five thousand, four hundred ninety-one".