475645721 has 2 divisors, whose sum is σ = 475645722. Its totient is φ = 475645720.

The previous prime is 475645699. The next prime is 475645759. The reversal of 475645721 is 127546574.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 473671696 + 1974025 = 21764^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 475645721 - 2²² = 471451417 is a prime.

It is not a weakly prime, because it can be changed into another prime (475645021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237822860 + 237822861.

It is an arithmetic number, because the mean of its divisors is an integer number (237822861).

Almost surely, 2^475645721 is an apocalyptic number.

It is an amenable number.

475645721 is a deficient number, since it is larger than the sum of its proper divisors (1).

475645721 is an equidigital number, since it uses as much as digits as its factorization.

475645721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 41.

The square root of 475645721 is about 21809.3035422959. The cubic root of 475645721 is about 780.5987737372.

The spelling of 475645721 in words is "four hundred seventy-five million, six hundred forty-five thousand, seven hundred twenty-one".