646134521 has 8 divisors (see below), whose sum is σ = 698699520. Its totient is φ = 595187008.

The previous prime is 646134497. The next prime is 646134527. The reversal of 646134521 is 125431646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646134521 - 2¹⁰ = 646133497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646134527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403541 + ... + 405138.

It is an arithmetic number, because the mean of its divisors is an integer number (87337440).

Almost surely, 2^646134521 is an apocalyptic number.

It is an amenable number.

646134521 is a deficient number, since it is larger than the sum of its proper divisors (52564999).

646134521 is a wasteful number, since it uses less digits than its factorization.

646134521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808743.

The product of its digits is 17280, while the sum is 32.

The square root of 646134521 is about 25419.1762455041. The cubic root of 646134521 is about 864.5185470496.

The spelling of 646134521 in words is "six hundred forty-six million, one hundred thirty-four thousand, five hundred twenty-one".