135385921 has 4 divisors (see below), whose sum is σ = 147693744. Its totient is φ = 123078100.

The previous prime is 135385919. The next prime is 135385927. The reversal of 135385921 is 129583531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135385921 - 2¹ = 135385919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135385927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6153895 + ... + 6153916.

It is an arithmetic number, because the mean of its divisors is an integer number (36923436).

Almost surely, 2^135385921 is an apocalyptic number.

135385921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135385921 is a deficient number, since it is larger than the sum of its proper divisors (12307823).

135385921 is a wasteful number, since it uses less digits than its factorization.

135385921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12307822.

The product of its digits is 32400, while the sum is 37.

The square root of 135385921 is about 11635.5455823954. The cubic root of 135385921 is about 513.4811453335.

The spelling of 135385921 in words is "one hundred thirty-five million, three hundred eighty-five thousand, nine hundred twenty-one".