135431 has 2 divisors, whose sum is σ = 135432. Its totient is φ = 135430.

The previous prime is 135427. The next prime is 135433. The reversal of 135431 is 134531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135431 - 2² = 135427 is a prime.

It is a super-2 number, since 2×135431² = 36683111522, which contains 22 as substring.

Together with 135433, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67715 + 67716.

It is an arithmetic number, because the mean of its divisors is an integer number (67716).

2¹³⁵⁴³¹ is an apocalyptic number.

135431 is a deficient number, since it is larger than the sum of its proper divisors (1).

135431 is an equidigital number, since it uses as much as digits as its factorization.

135431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 17.

The square root of 135431 is about 368.0095107467. The cubic root of 135431 is about 51.3538129713.

Adding to 135431 its reverse (134531), we get a palindrome (269962).

Subtracting from 135431 its reverse (134531), we obtain a square (900 = 30²).

It can be divided in two parts, 135 and 431, that multiplied together give a palindrome (58185).

The spelling of 135431 in words is "one hundred thirty-five thousand, four hundred thirty-one".