477721631 has 2 divisors, whose sum is σ = 477721632. Its totient is φ = 477721630.

The previous prime is 477721609. The next prime is 477721639. The reversal of 477721631 is 136127774.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 477721631 - 2⁶ = 477721567 is a prime.

It is a super-2 number, since 2×477721631² = 456435913450600322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (477721639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238860815 + 238860816.

It is an arithmetic number, because the mean of its divisors is an integer number (238860816).

Almost surely, 2^477721631 is an apocalyptic number.

477721631 is a deficient number, since it is larger than the sum of its proper divisors (1).

477721631 is an equidigital number, since it uses as much as digits as its factorization.

477721631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 38.

The square root of 477721631 is about 21856.8440311039. The cubic root of 477721631 is about 781.7327417247.

The spelling of 477721631 in words is "four hundred seventy-seven million, seven hundred twenty-one thousand, six hundred thirty-one".