646319353 has 2 divisors, whose sum is σ = 646319354. Its totient is φ = 646319352.

The previous prime is 646319329. The next prime is 646319363. The reversal of 646319353 is 353913646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617621904 + 28697449 = 24852^2 + 5357^2 .

It is a cyclic number.

It is not a de Polignac number, because 646319353 - 2¹³ = 646311161 is a prime.

It is not a weakly prime, because it can be changed into another prime (646319363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323159676 + 323159677.

It is an arithmetic number, because the mean of its divisors is an integer number (323159677).

Almost surely, 2^646319353 is an apocalyptic number.

It is an amenable number.

646319353 is a deficient number, since it is larger than the sum of its proper divisors (1).

646319353 is an equidigital number, since it uses as much as digits as its factorization.

646319353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 40.

The square root of 646319353 is about 25422.8116659035. The cubic root of 646319353 is about 864.6009733622.

It can be divided in two parts, 64631 and 9353, that added together give a square (73984 = 272²).

The spelling of 646319353 in words is "six hundred forty-six million, three hundred nineteen thousand, three hundred fifty-three".