478521977 has 2 divisors, whose sum is σ = 478521978. Its totient is φ = 478521976.

The previous prime is 478521949. The next prime is 478521991. The reversal of 478521977 is 779125874.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 471063616 + 7458361 = 21704^2 + 2731^2 .

It is a cyclic number.

It is not a de Polignac number, because 478521977 - 2⁶ = 478521913 is a prime.

It is not a weakly prime, because it can be changed into another prime (478521907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239260988 + 239260989.

It is an arithmetic number, because the mean of its divisors is an integer number (239260989).

Almost surely, 2^478521977 is an apocalyptic number.

It is an amenable number.

478521977 is a deficient number, since it is larger than the sum of its proper divisors (1).

478521977 is an equidigital number, since it uses as much as digits as its factorization.

478521977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 50.

The square root of 478521977 is about 21875.1451880896. The cubic root of 478521977 is about 782.1690541162.

It can be divided in two parts, 4785 and 21977, that added together give a palindrome (26762).

The spelling of 478521977 in words is "four hundred seventy-eight million, five hundred twenty-one thousand, nine hundred seventy-seven".