646121494 has 8 divisors (see below), whose sum is σ = 969404328. Its totient is φ = 322986720.

The previous prime is 646121477. The next prime is 646121503. The reversal of 646121494 is 494121646.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25372 + ... + 43999.

It is an arithmetic number, because the mean of its divisors is an integer number (121175541).

Almost surely, 2^646121494 is an apocalyptic number.

646121494 is a deficient number, since it is larger than the sum of its proper divisors (323282834).

646121494 is a wasteful number, since it uses less digits than its factorization.

646121494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74030.

The product of its digits is 41472, while the sum is 37.

The square root of 646121494 is about 25418.9200006609. The cubic root of 646121494 is about 864.5127370320.

The spelling of 646121494 in words is "six hundred forty-six million, one hundred twenty-one thousand, four hundred ninety-four".