131138431 has 2 divisors, whose sum is σ = 131138432. Its totient is φ = 131138430.

The previous prime is 131138419. The next prime is 131138461. The reversal of 131138431 is 134831131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131138431 - 2¹³ = 131130239 is a prime.

It is a super-2 number, since 2×131138431² = 34394576170283522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131138396 and 131138405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131138411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65569215 + 65569216.

It is an arithmetic number, because the mean of its divisors is an integer number (65569216).

Almost surely, 2^131138431 is an apocalyptic number.

131138431 is a deficient number, since it is larger than the sum of its proper divisors (1).

131138431 is an equidigital number, since it uses as much as digits as its factorization.

131138431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 131138431 is about 11451.5689318102. The cubic root of 131138431 is about 508.0541397132.

Adding to 131138431 its reverse (134831131), we get a palindrome (265969562).

The spelling of 131138431 in words is "one hundred thirty-one million, one hundred thirty-eight thousand, four hundred thirty-one".