646948259 has 4 divisors (see below), whose sum is σ = 648110304. Its totient is φ = 645786216.

The previous prime is 646948229. The next prime is 646948261. The reversal of 646948259 is 952849646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646948259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646948259.

It is not an unprimeable number, because it can be changed into a prime (646948229) 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, 580187 + ... + 581300.

It is an arithmetic number, because the mean of its divisors is an integer number (162027576).

Almost surely, 2^646948259 is an apocalyptic number.

646948259 is a deficient number, since it is larger than the sum of its proper divisors (1162045).

646948259 is a wasteful number, since it uses less digits than its factorization.

646948259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162044.

The product of its digits is 3732480, while the sum is 53.

The square root of 646948259 is about 25435.1775893152. The cubic root of 646948259 is about 864.8813179859.

The spelling of 646948259 in words is "six hundred forty-six million, nine hundred forty-eight thousand, two hundred fifty-nine".