135508881 has 8 divisors (see below), whose sum is σ = 180733504. Its totient is φ = 90311760.

The previous prime is 135508859. The next prime is 135508883. The reversal of 135508881 is 188805531.

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

It is not a de Polignac number, because 135508881 - 2⁹ = 135508369 is a prime.

It is a super-2 number, since 2×135508881² = 36725313659744322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135508883) 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, 12135 + ... + 20451.

It is an arithmetic number, because the mean of its divisors is an integer number (22591688).

Almost surely, 2^135508881 is an apocalyptic number.

It is an amenable number.

135508881 is a deficient number, since it is larger than the sum of its proper divisors (45224623).

135508881 is an equidigital number, since it uses as much as digits as its factorization.

135508881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13751.

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 135508881 is about 11640.8281921863. The cubic root of 135508881 is about 513.6365493237.

The spelling of 135508881 in words is "one hundred thirty-five million, five hundred eight thousand, eight hundred eighty-one".