131431431 has 16 divisors (see below), whose sum is σ = 178076160. Its totient is φ = 86211840.

The previous prime is 131431423. The next prime is 131431439. The reversal of 131431431 is 134134131.

It is an interprime number because it is at equal distance from previous prime (131431423) and next prime (131431439).

It is not a de Polignac number, because 131431431 - 2³ = 131431423 is a prime.

It is a super-2 number, since 2×131431431² = 34548442109415522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131431398 and 131431407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131431439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82876 + ... + 84446.

It is an arithmetic number, because the mean of its divisors is an integer number (11129760).

Almost surely, 2^131431431 is an apocalyptic number.

131431431 is a deficient number, since it is larger than the sum of its proper divisors (46644729).

131431431 is a wasteful number, since it uses less digits than its factorization.

131431431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006.

The product of its digits is 432, while the sum is 21.

The square root of 131431431 is about 11464.3548008599. The cubic root of 131431431 is about 508.4322366965.

Adding to 131431431 its reverse (134134131), we get a palindrome (265565562).

The spelling of 131431431 in words is "one hundred thirty-one million, four hundred thirty-one thousand, four hundred thirty-one".