475657621 has 4 divisors (see below), whose sum is σ = 476164044. Its totient is φ = 475151200.

The previous prime is 475657619. The next prime is 475657631. The reversal of 475657621 is 126756574.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204890596 + 270767025 = 14314^2 + 16455^2 .

It is a cyclic number.

It is not a de Polignac number, because 475657621 - 2¹ = 475657619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (475657631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251800 + ... + 253681.

It is an arithmetic number, because the mean of its divisors is an integer number (119041011).

Almost surely, 2^475657621 is an apocalyptic number.

It is an amenable number.

475657621 is a deficient number, since it is larger than the sum of its proper divisors (506423).

475657621 is an equidigital number, since it uses as much as digits as its factorization.

475657621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506422.

The product of its digits is 352800, while the sum is 43.

The square root of 475657621 is about 21809.5763599388. The cubic root of 475657621 is about 780.6052835179.

The spelling of 475657621 in words is "four hundred seventy-five million, six hundred fifty-seven thousand, six hundred twenty-one".