477647021 has 2 divisors, whose sum is σ = 477647022. Its totient is φ = 477647020.

The previous prime is 477646999. The next prime is 477647083. The reversal of 477647021 is 120746774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303142921 + 174504100 = 17411^2 + 13210^2 .

It is a cyclic number.

It is not a de Polignac number, because 477647021 - 2¹⁸ = 477384877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (477640021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238823510 + 238823511.

It is an arithmetic number, because the mean of its divisors is an integer number (238823511).

Almost surely, 2^477647021 is an apocalyptic number.

It is an amenable number.

477647021 is a deficient number, since it is larger than the sum of its proper divisors (1).

477647021 is an equidigital number, since it uses as much as digits as its factorization.

477647021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 477647021 is about 21855.1371764169. The cubic root of 477647021 is about 781.6920429072.

The spelling of 477647021 in words is "four hundred seventy-seven million, six hundred forty-seven thousand, twenty-one".