131111431 has 32 divisors (see below), whose sum is σ = 156856320. Its totient is φ = 108345600.

The previous prime is 131111389. The next prime is 131111437. The reversal of 131111431 is 134111131.

It is not a de Polignac number, because 131111431 - 2¹¹ = 131109383 is a prime.

It is a super-2 number, since 2×131111431² = 34380414677735522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131111437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 572425 + ... + 572653.

It is an arithmetic number, because the mean of its divisors is an integer number (4901760).

Almost surely, 2^131111431 is an apocalyptic number.

131111431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131111431 is a deficient number, since it is larger than the sum of its proper divisors (25744889).

131111431 is a wasteful number, since it uses less digits than its factorization.

131111431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367.

The product of its digits is 36, while the sum is 16.

The square root of 131111431 is about 11450.3899933583. The cubic root of 131111431 is about 508.0192696826.

Adding to 131111431 its reverse (134111131), we get a palindrome (265222562).

The spelling of 131111431 in words is "one hundred thirty-one million, one hundred eleven thousand, four hundred thirty-one".