135515891 has 16 divisors (see below), whose sum is σ = 164307456. Its totient is φ = 109109376.

The previous prime is 135515873. The next prime is 135515893. The reversal of 135515891 is 198515531.

It is a cyclic number.

It is not a de Polignac number, because 135515891 - 2⁶ = 135515827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135515893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92930 + ... + 94376.

It is an arithmetic number, because the mean of its divisors is an integer number (10269216).

Almost surely, 2^135515891 is an apocalyptic number.

135515891 is a deficient number, since it is larger than the sum of its proper divisors (28791565).

135515891 is a wasteful number, since it uses less digits than its factorization.

135515891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258.

The product of its digits is 27000, while the sum is 38.

The square root of 135515891 is about 11641.1292837078. The cubic root of 135515891 is about 513.6454061359.

The spelling of 135515891 in words is "one hundred thirty-five million, five hundred fifteen thousand, eight hundred ninety-one".