475213621 has 4 divisors (see below), whose sum is σ = 475412652. Its totient is φ = 475014592.

The previous prime is 475213619. The next prime is 475213637. The reversal of 475213621 is 126312574.

475213621 = 15414² + 15415².

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 237591396 + 237622225 = 15414^2 + 15415^2 .

It is a cyclic number.

It is not a de Polignac number, because 475213621 - 2¹ = 475213619 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 (475213421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95890 + ... + 100723.

It is an arithmetic number, because the mean of its divisors is an integer number (118853163).

Almost surely, 2^475213621 is an apocalyptic number.

475213621 is the 15415-th centered square number.

It is an amenable number.

475213621 is a deficient number, since it is larger than the sum of its proper divisors (199031).

475213621 is a wasteful number, since it uses less digits than its factorization.

475213621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199030.

The product of its digits is 10080, while the sum is 31.

The square root of 475213621 is about 21799.3949686683. The cubic root of 475213621 is about 780.3623239975.

The spelling of 475213621 in words is "four hundred seventy-five million, two hundred thirteen thousand, six hundred twenty-one".