135125661 has 24 divisors (see below), whose sum is σ = 199380832. Its totient is φ = 81338400.

The previous prime is 135125659. The next prime is 135125671. The reversal of 135125661 is 166521531.

135125661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135125661 - 2¹ = 135125659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135125671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55806 + ... + 58176.

Almost surely, 2^135125661 is an apocalyptic number.

135125661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135125661 is a deficient number, since it is larger than the sum of its proper divisors (64255171).

135125661 is a wasteful number, since it uses less digits than its factorization.

135125661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553 (or 2542 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 135125661 is about 11624.3563692791. The cubic root of 135125661 is about 513.1519030038.

The spelling of 135125661 in words is "one hundred thirty-five million, one hundred twenty-five thousand, six hundred sixty-one".