253965643 has 2 divisors, whose sum is σ = 253965644. Its totient is φ = 253965642.

The previous prime is 253965637. The next prime is 253965659. The reversal of 253965643 is 346569352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253965643 - 2¹⁷ = 253834571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 253965643.

It is not a weakly prime, because it can be changed into another prime (253965623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126982821 + 126982822.

It is an arithmetic number, because the mean of its divisors is an integer number (126982822).

Almost surely, 2^253965643 is an apocalyptic number.

253965643 is a deficient number, since it is larger than the sum of its proper divisors (1).

253965643 is an equidigital number, since it uses as much as digits as its factorization.

253965643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 43.

The square root of 253965643 is about 15936.2995391025. The cubic root of 253965643 is about 633.2739975498.

The spelling of 253965643 in words is "two hundred fifty-three million, nine hundred sixty-five thousand, six hundred forty-three".