475907921 has 2 divisors, whose sum is σ = 475907922. Its totient is φ = 475907920.

The previous prime is 475907897. The next prime is 475907933. The reversal of 475907921 is 129709574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354907921 + 121000000 = 18839^2 + 11000^2 .

It is a cyclic number.

It is not a de Polignac number, because 475907921 - 2¹⁰ = 475906897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (475907021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237953960 + 237953961.

It is an arithmetic number, because the mean of its divisors is an integer number (237953961).

Almost surely, 2^475907921 is an apocalyptic number.

It is an amenable number.

475907921 is a deficient number, since it is larger than the sum of its proper divisors (1).

475907921 is an equidigital number, since it uses as much as digits as its factorization.

475907921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 475907921 is about 21815.3139101870. The cubic root of 475907921 is about 780.7421825758.

The spelling of 475907921 in words is "four hundred seventy-five million, nine hundred seven thousand, nine hundred twenty-one".