135555331 has 8 divisors (see below), whose sum is σ = 143763984. Its totient is φ = 127372800.

The previous prime is 135555319. The next prime is 135555337. The reversal of 135555331 is 133555531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135555331 - 2²³ = 127166723 is a prime.

It is a super-2 number, since 2×135555331² = 36750495525039122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135555293 and 135555302.

It is not an unprimeable number, because it can be changed into a prime (135555337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4731 + ... + 17131.

It is an arithmetic number, because the mean of its divisors is an integer number (17970498).

Almost surely, 2^135555331 is an apocalyptic number.

135555331 is a deficient number, since it is larger than the sum of its proper divisors (8208653).

135555331 is a wasteful number, since it uses less digits than its factorization.

135555331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13061.

The product of its digits is 16875, while the sum is 31.

The square root of 135555331 is about 11642.8231542010. The cubic root of 135555331 is about 513.6952310671.

The spelling of 135555331 in words is "one hundred thirty-five million, five hundred fifty-five thousand, three hundred thirty-one".