135121556 has 12 divisors (see below), whose sum is σ = 244616820. Its totient is φ = 65231040.

The previous prime is 135121549. The next prime is 135121561. The reversal of 135121556 is 655121531.

It can be written as a sum of positive squares in 2 ways, for example, as 107453956 + 27667600 = 10366^2 + 5260^2 .

It is a super-2 number, since 2×135121556² = 36515669791722272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582305 + ... + 582536.

It is an arithmetic number, because the mean of its divisors is an integer number (20384735).

Almost surely, 2^135121556 is an apocalyptic number.

It is an amenable number.

135121556 is a deficient number, since it is larger than the sum of its proper divisors (109495264).

135121556 is a wasteful number, since it uses less digits than its factorization.

135121556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164874 (or 1164872 counting only the distinct ones).

The product of its digits is 4500, while the sum is 29.

The square root of 135121556 is about 11624.1797990224. The cubic root of 135121556 is about 513.1467065817.

The spelling of 135121556 in words is "one hundred thirty-five million, one hundred twenty-one thousand, five hundred fifty-six".