646261373 has 2 divisors, whose sum is σ = 646261374. Its totient is φ = 646261372.

The previous prime is 646261361. The next prime is 646261391. The reversal of 646261373 is 373162646.

646261373 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458516569 + 187744804 = 21413^2 + 13702^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646261373 is a prime.

It is a super-3 number, since 3×646261373³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646261313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323130686 + 323130687.

It is an arithmetic number, because the mean of its divisors is an integer number (323130687).

Almost surely, 2^646261373 is an apocalyptic number.

It is an amenable number.

646261373 is a deficient number, since it is larger than the sum of its proper divisors (1).

646261373 is an equidigital number, since it uses as much as digits as its factorization.

646261373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 38.

The square root of 646261373 is about 25421.6713258590. The cubic root of 646261373 is about 864.5751187217.

The spelling of 646261373 in words is "six hundred forty-six million, two hundred sixty-one thousand, three hundred seventy-three".