134645921 has 4 divisors (see below), whose sum is σ = 135452352. Its totient is φ = 133839492.

The previous prime is 134645909. The next prime is 134645939. The reversal of 134645921 is 129546431.

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 a de Polignac number, because none of the positive numbers 2^k-134645921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (134645981) 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, 402965 + ... + 403298.

It is an arithmetic number, because the mean of its divisors is an integer number (33863088).

Almost surely, 2^134645921 is an apocalyptic number.

It is an amenable number.

134645921 is a deficient number, since it is larger than the sum of its proper divisors (806431).

134645921 is an equidigital number, since it uses as much as digits as its factorization.

134645921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806430.

The product of its digits is 25920, while the sum is 35.

The square root of 134645921 is about 11603.7029003676. The cubic root of 134645921 is about 512.5438975685.

The spelling of 134645921 in words is "one hundred thirty-four million, six hundred forty-five thousand, nine hundred twenty-one".