475643879 has 2 divisors, whose sum is σ = 475643880. Its totient is φ = 475643878.

The previous prime is 475643821. The next prime is 475643897. The reversal of 475643879 is 978346574.

Together with next prime (475643897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-475643879 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 475643879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (475643579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237821939 + 237821940.

It is an arithmetic number, because the mean of its divisors is an integer number (237821940).

Almost surely, 2^475643879 is an apocalyptic number.

475643879 is a deficient number, since it is larger than the sum of its proper divisors (1).

475643879 is an equidigital number, since it uses as much as digits as its factorization.

475643879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 53.

The square root of 475643879 is about 21809.2613125709. The cubic root of 475643879 is about 780.5977660791.

The spelling of 475643879 in words is "four hundred seventy-five million, six hundred forty-three thousand, eight hundred seventy-nine".