645682469 has 2 divisors, whose sum is σ = 645682470. Its totient is φ = 645682468.

The previous prime is 645682421. The next prime is 645682487. The reversal of 645682469 is 964286546.

645682469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 357701569 + 287980900 = 18913^2 + 16970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645682469 is a prime.

It is a super-2 number, since 2×645682469² = 833811701547871922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645682069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322841234 + 322841235.

It is an arithmetic number, because the mean of its divisors is an integer number (322841235).

Almost surely, 2^645682469 is an apocalyptic number.

It is an amenable number.

645682469 is a deficient number, since it is larger than the sum of its proper divisors (1).

645682469 is an equidigital number, since it uses as much as digits as its factorization.

645682469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 50.

The square root of 645682469 is about 25410.2827414415. The cubic root of 645682469 is about 864.3168870234.

The spelling of 645682469 in words is "six hundred forty-five million, six hundred eighty-two thousand, four hundred sixty-nine".