475506781 has 4 divisors (see below), whose sum is σ = 475597564. Its totient is φ = 475416000.

The previous prime is 475506679. The next prime is 475506791. The reversal of 475506781 is 187605574.

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 221741881 + 253764900 = 14891^2 + 15930^2 .

It is a cyclic number.

It is not a de Polignac number, because 475506781 - 2¹³ = 475498589 is a prime.

It is a super-2 number, since 2×475506781² = 452213397553963922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (475506791) 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, 37020 + ... + 48181.

It is an arithmetic number, because the mean of its divisors is an integer number (118899391).

Almost surely, 2^475506781 is an apocalyptic number.

It is an amenable number.

475506781 is a deficient number, since it is larger than the sum of its proper divisors (90783).

475506781 is an equidigital number, since it uses as much as digits as its factorization.

475506781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90782.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 475506781 is about 21806.1179717986. The cubic root of 475506781 is about 780.5227599095.

The spelling of 475506781 in words is "four hundred seventy-five million, five hundred six thousand, seven hundred eighty-one".