477991121 has 2 divisors, whose sum is σ = 477991122. Its totient is φ = 477991120.

The previous prime is 477991069. The next prime is 477991177. The reversal of 477991121 is 121199774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280897600 + 197093521 = 16760^2 + 14039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-477991121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (477951121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238995560 + 238995561.

It is an arithmetic number, because the mean of its divisors is an integer number (238995561).

Almost surely, 2^477991121 is an apocalyptic number.

It is an amenable number.

477991121 is a deficient number, since it is larger than the sum of its proper divisors (1).

477991121 is an equidigital number, since it uses as much as digits as its factorization.

477991121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 41.

The square root of 477991121 is about 21863.0080501289. The cubic root of 477991121 is about 781.8797098483.

The spelling of 477991121 in words is "four hundred seventy-seven million, nine hundred ninety-one thousand, one hundred twenty-one".