645262843 has 2 divisors, whose sum is σ = 645262844. Its totient is φ = 645262842.

The previous prime is 645262837. The next prime is 645262853. The reversal of 645262843 is 348262546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645262843 - 2²⁹ = 108391931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645262796 and 645262805.

It is not a weakly prime, because it can be changed into another prime (645262823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322631421 + 322631422.

It is an arithmetic number, because the mean of its divisors is an integer number (322631422).

Almost surely, 2^645262843 is an apocalyptic number.

645262843 is a deficient number, since it is larger than the sum of its proper divisors (1).

645262843 is an equidigital number, since it uses as much as digits as its factorization.

645262843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 40.

The square root of 645262843 is about 25402.0243878318. The cubic root of 645262843 is about 864.1296079536.

The spelling of 645262843 in words is "six hundred forty-five million, two hundred sixty-two thousand, eight hundred forty-three".