135229431 has 4 divisors (see below), whose sum is σ = 180305912. Its totient is φ = 90152952.

The previous prime is 135229417. The next prime is 135229463. The reversal of 135229431 is 134922531.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 135229431 - 2⁵ = 135229399 is a prime.

It is a super-2 number, since 2×135229431² = 36573998017167522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135229411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22538236 + ... + 22538241.

It is an arithmetic number, because the mean of its divisors is an integer number (45076478).

Almost surely, 2^135229431 is an apocalyptic number.

135229431 is a deficient number, since it is larger than the sum of its proper divisors (45076481).

135229431 is an equidigital number, since it uses as much as digits as its factorization.

135229431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45076480.

The product of its digits is 6480, while the sum is 30.

The square root of 135229431 is about 11628.8189856064. The cubic root of 135229431 is about 513.2832280418.

The spelling of 135229431 in words is "one hundred thirty-five million, two hundred twenty-nine thousand, four hundred thirty-one".