646251213 has 8 divisors (see below), whose sum is σ = 884956768. Its totient is φ = 419189904.

The previous prime is 646251173. The next prime is 646251239. The reversal of 646251213 is 312152646.

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

It is not a de Polignac number, because 646251213 - 2¹² = 646247117 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 (646251253) 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, 2910931 + ... + 2911152.

It is an arithmetic number, because the mean of its divisors is an integer number (110619596).

Almost surely, 2^646251213 is an apocalyptic number.

It is an amenable number.

646251213 is a deficient number, since it is larger than the sum of its proper divisors (238705555).

646251213 is a wasteful number, since it uses less digits than its factorization.

646251213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5822123.

The product of its digits is 8640, while the sum is 30.

The square root of 646251213 is about 25421.4714955685. The cubic root of 646251213 is about 864.5705879804.

It can be divided in two parts, 6462 and 51213, that added together give a palindrome (57675).

The spelling of 646251213 in words is "six hundred forty-six million, two hundred fifty-one thousand, two hundred thirteen".