131023491 has 4 divisors (see below), whose sum is σ = 174697992. Its totient is φ = 87348992.

The previous prime is 131023481. The next prime is 131023511. The reversal of 131023491 is 194320131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194320131 = 3 ⋅64773377.

It is a cyclic number.

It is not a de Polignac number, because 131023491 - 2¹⁸ = 130761347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131023481) 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, 21837246 + ... + 21837251.

It is an arithmetic number, because the mean of its divisors is an integer number (43674498).

Almost surely, 2^131023491 is an apocalyptic number.

131023491 is a deficient number, since it is larger than the sum of its proper divisors (43674501).

131023491 is an equidigital number, since it uses as much as digits as its factorization.

131023491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43674500.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 131023491 is about 11446.5493053584. The cubic root of 131023491 is about 507.9056635023.

The spelling of 131023491 in words is "one hundred thirty-one million, twenty-three thousand, four hundred ninety-one".