131243431 has 16 divisors (see below), whose sum is σ = 151320960. Its totient is φ = 112574880.

The previous prime is 131243347. The next prime is 131243443. The reversal of 131243431 is 134342131.

It is not a de Polignac number, because 131243431 - 2¹⁵ = 131210663 is a prime.

It is a super-2 number, since 2×131243431² = 34449676361303522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131243461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56760 + ... + 59026.

It is an arithmetic number, because the mean of its divisors is an integer number (9457560).

Almost surely, 2^131243431 is an apocalyptic number.

131243431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131243431 is a deficient number, since it is larger than the sum of its proper divisors (20077529).

131243431 is a wasteful number, since it uses less digits than its factorization.

131243431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574.

The product of its digits is 864, while the sum is 22.

The square root of 131243431 is about 11456.1525391381. The cubic root of 131243431 is about 508.1896999070.

Adding to 131243431 its reverse (134342131), we get a palindrome (265585562).

The spelling of 131243431 in words is "one hundred thirty-one million, two hundred forty-three thousand, four hundred thirty-one".