475399621 has 2 divisors, whose sum is σ = 475399622. Its totient is φ = 475399620.

The previous prime is 475399607. The next prime is 475399667. The reversal of 475399621 is 126993574.

It is a happy number.

It is an a-pointer prime, because the next prime (475399667) can be obtained adding 475399621 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370562500 + 104837121 = 19250^2 + 10239^2 .

It is a cyclic number.

It is not a de Polignac number, because 475399621 - 2⁷ = 475399493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (475399921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237699810 + 237699811.

It is an arithmetic number, because the mean of its divisors is an integer number (237699811).

Almost surely, 2^475399621 is an apocalyptic number.

It is an amenable number.

475399621 is a deficient number, since it is larger than the sum of its proper divisors (1).

475399621 is an equidigital number, since it uses as much as digits as its factorization.

475399621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 475399621 is about 21803.6607247499. The cubic root of 475399621 is about 780.4641227486.

The spelling of 475399621 in words is "four hundred seventy-five million, three hundred ninety-nine thousand, six hundred twenty-one".