645043379 has 2 divisors, whose sum is σ = 645043380. Its totient is φ = 645043378.

The previous prime is 645043363. The next prime is 645043411. The reversal of 645043379 is 973340546.

645043379 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 is a cyclic number.

It is not a de Polignac number, because 645043379 - 2⁴ = 645043363 is a prime.

It is equal to p_33548882 and since 645043379 and 33548882 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (645043279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322521689 + 322521690.

It is an arithmetic number, because the mean of its divisors is an integer number (322521690).

Almost surely, 2^645043379 is an apocalyptic number.

645043379 is a deficient number, since it is larger than the sum of its proper divisors (1).

645043379 is an equidigital number, since it uses as much as digits as its factorization.

645043379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 41.

The square root of 645043379 is about 25397.7042072704. The cubic root of 645043379 is about 864.0316288397.

The spelling of 645043379 in words is "six hundred forty-five million, forty-three thousand, three hundred seventy-nine".