135321431 has 4 divisors (see below), whose sum is σ = 154653072. Its totient is φ = 115989792.

The previous prime is 135321427. The next prime is 135321437. The reversal of 135321431 is 134123531.

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

It is a cyclic number.

It is not a de Polignac number, because 135321431 - 2² = 135321427 is a prime.

It is a super-2 number, since 2×135321431² = 36623779375775522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 135321397 and 135321406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135321437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9665810 + ... + 9665823.

It is an arithmetic number, because the mean of its divisors is an integer number (38663268).

Almost surely, 2^135321431 is an apocalyptic number.

135321431 is a deficient number, since it is larger than the sum of its proper divisors (19331641).

135321431 is an equidigital number, since it uses as much as digits as its factorization.

135321431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19331640.

The product of its digits is 1080, while the sum is 23.

The square root of 135321431 is about 11632.7740027906. The cubic root of 135321431 is about 513.3996015065.

Adding to 135321431 its reverse (134123531), we get a palindrome (269444962).

The spelling of 135321431 in words is "one hundred thirty-five million, three hundred twenty-one thousand, four hundred thirty-one".