135955921 has 4 divisors (see below), whose sum is σ = 141867072. Its totient is φ = 130044772.

The previous prime is 135955903. The next prime is 135955943. The reversal of 135955921 is 129559531.

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 135955921 - 2⁷ = 135955793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135955961) by changing a digit.

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, 2955541 + ... + 2955586.

It is an arithmetic number, because the mean of its divisors is an integer number (35466768).

Almost surely, 2^135955921 is an apocalyptic number.

It is an amenable number.

135955921 is a deficient number, since it is larger than the sum of its proper divisors (5911151).

135955921 is an equidigital number, since it uses as much as digits as its factorization.

135955921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911150.

The product of its digits is 60750, while the sum is 40.

The square root of 135955921 is about 11660.0137650005. The cubic root of 135955921 is about 514.2007535394.

The spelling of 135955921 in words is "one hundred thirty-five million, nine hundred fifty-five thousand, nine hundred twenty-one".