646284591 has 12 divisors (see below), whose sum is σ = 936508768. Its totient is φ = 429477984.

The previous prime is 646284581. The next prime is 646284593. The reversal of 646284591 is 195482646.

It is not a de Polignac number, because 646284591 - 2²⁹ = 109413679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646284593) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111895 + ... + 117528.

Almost surely, 2^646284591 is an apocalyptic number.

646284591 is a deficient number, since it is larger than the sum of its proper divisors (290224177).

646284591 is a wasteful number, since it uses less digits than its factorization.

646284591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229742 (or 229739 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 646284591 is about 25422.1279793805. The cubic root of 646284591 is about 864.5854723575.

The spelling of 646284591 in words is "six hundred forty-six million, two hundred eighty-four thousand, five hundred ninety-one".