472778321 has 2 divisors, whose sum is σ = 472778322. Its totient is φ = 472778320.

The previous prime is 472778309. The next prime is 472778333. The reversal of 472778321 is 123877274.

It is a balanced prime because it is at equal distance from previous prime (472778309) and next prime (472778333).

It can be written as a sum of positive squares in only one way, i.e., 421727296 + 51051025 = 20536^2 + 7145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-472778321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (472778521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 236389160 + 236389161.

It is an arithmetic number, because the mean of its divisors is an integer number (236389161).

Almost surely, 2^472778321 is an apocalyptic number.

It is an amenable number.

472778321 is a deficient number, since it is larger than the sum of its proper divisors (1).

472778321 is an equidigital number, since it uses as much as digits as its factorization.

472778321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131712, while the sum is 41.

The square root of 472778321 is about 21743.4661680239. The cubic root of 472778321 is about 779.0270143769.

The spelling of 472778321 in words is "four hundred seventy-two million, seven hundred seventy-eight thousand, three hundred twenty-one".