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131431 is a prime number
BaseRepresentation
bin100000000101100111
320200021211
4200011213
513201211
62452251
71055116
oct400547
9220254
10131431
118a823
1264087
1347a91
1435c7d
1528e21
hex20167

131431 has 2 divisors, whose sum is σ = 131432. Its totient is φ = 131430.

The previous prime is 131413. The next prime is 131437. The reversal of 131431 is 134131.

Adding to 131431 its reverse (134131), we get a palindrome (265562).

It can be divided in two parts, 13 and 1431, that added together give a square (1444 = 382).

Together with previous prime (131413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131431 - 27 = 131303 is a prime.

It is a super-2 number, since 2×1314312 = 34548215522, which contains 22 as substring.

131431 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65715 + 65716.

It is an arithmetic number, because the mean of its divisors is an integer number (65716).

2131431 is an apocalyptic number.

131431 is a deficient number, since it is larger than the sum of its proper divisors (1).

131431 is an equidigital number, since it uses as much as digits as its factorization.

131431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 13.

The square root of 131431 is about 362.5341363237. The cubic root of 131431 is about 50.8431680933.

The spelling of 131431 in words is "one hundred thirty-one thousand, four hundred thirty-one".