477721649 has 2 divisors, whose sum is σ = 477721650. Its totient is φ = 477721648.

The previous prime is 477721639. The next prime is 477721663. The reversal of 477721649 is 946127774.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 472627600 + 5094049 = 21740^2 + 2257^2 .

It is a cyclic number.

It is not a de Polignac number, because 477721649 - 2²⁰ = 476673073 is a prime.

It is not a weakly prime, because it can be changed into another prime (477721609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238860824 + 238860825.

It is an arithmetic number, because the mean of its divisors is an integer number (238860825).

Almost surely, 2^477721649 is an apocalyptic number.

It is an amenable number.

477721649 is a deficient number, since it is larger than the sum of its proper divisors (1).

477721649 is an equidigital number, since it uses as much as digits as its factorization.

477721649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 592704, while the sum is 47.

The square root of 477721649 is about 21856.8444428742. The cubic root of 477721649 is about 781.7327515430.

The spelling of 477721649 in words is "four hundred seventy-seven million, seven hundred twenty-one thousand, six hundred forty-nine".