645057349 has 2 divisors, whose sum is σ = 645057350. Its totient is φ = 645057348.

The previous prime is 645057337. The next prime is 645057359. The reversal of 645057349 is 943750546.

645057349 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., 641608900 + 3448449 = 25330^2 + 1857^2 .

It is a cyclic number.

It is not a de Polignac number, because 645057349 - 2⁷ = 645057221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645057359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322528674 + 322528675.

It is an arithmetic number, because the mean of its divisors is an integer number (322528675).

Almost surely, 2^645057349 is an apocalyptic number.

It is an amenable number.

645057349 is a deficient number, since it is larger than the sum of its proper divisors (1).

645057349 is an equidigital number, since it uses as much as digits as its factorization.

645057349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 645057349 is about 25397.9792306396. The cubic root of 645057349 is about 864.0378663710.

The spelling of 645057349 in words is "six hundred forty-five million, fifty-seven thousand, three hundred forty-nine".