135441621 has 12 divisors (see below), whose sum is σ = 223586272. Its totient is φ = 77395176.

The previous prime is 135441619. The next prime is 135441653. The reversal of 135441621 is 126144531.

It is a happy number.

135441621 is a `hidden beast` number, since 1 + 35 + 4 + 4 + 1 + 621 = 666.

It is not a de Polignac number, because 135441621 - 2¹ = 135441619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135441611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1074871 + ... + 1074996.

Almost surely, 2^135441621 is an apocalyptic number.

It is an amenable number.

135441621 is a deficient number, since it is larger than the sum of its proper divisors (88144651).

135441621 is a wasteful number, since it uses less digits than its factorization.

135441621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149880 (or 2149877 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 135441621 is about 11637.9388639054. The cubic root of 135441621 is about 513.5515538816.

The spelling of 135441621 in words is "one hundred thirty-five million, four hundred forty-one thousand, six hundred twenty-one".