477681221 has 2 divisors, whose sum is σ = 477681222. Its totient is φ = 477681220.

The previous prime is 477681187. The next prime is 477681251. The reversal of 477681221 is 122186774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 454158721 + 23522500 = 21311^2 + 4850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-477681221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (477681251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238840610 + 238840611.

It is an arithmetic number, because the mean of its divisors is an integer number (238840611).

Almost surely, 2^477681221 is an apocalyptic number.

It is an amenable number.

477681221 is a deficient number, since it is larger than the sum of its proper divisors (1).

477681221 is an equidigital number, since it uses as much as digits as its factorization.

477681221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 38.

The square root of 477681221 is about 21855.9195871508. The cubic root of 477681221 is about 781.7106991035.

The spelling of 477681221 in words is "four hundred seventy-seven million, six hundred eighty-one thousand, two hundred twenty-one".