478945921 has 2 divisors, whose sum is σ = 478945922. Its totient is φ = 478945920.

The previous prime is 478945897. The next prime is 478945931. The reversal of 478945921 is 129549874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438483600 + 40462321 = 20940^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 478945921 - 2⁹ = 478945409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (478945931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239472960 + 239472961.

It is an arithmetic number, because the mean of its divisors is an integer number (239472961).

Almost surely, 2^478945921 is an apocalyptic number.

It is an amenable number.

478945921 is a deficient number, since it is larger than the sum of its proper divisors (1).

478945921 is an equidigital number, since it uses as much as digits as its factorization.

478945921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 478945921 is about 21884.8331270768. The cubic root of 478945921 is about 782.3999721070.

The spelling of 478945921 in words is "four hundred seventy-eight million, nine hundred forty-five thousand, nine hundred twenty-one".