472778309 has 2 divisors, whose sum is σ = 472778310. Its totient is φ = 472778308.

The previous prime is 472778287. The next prime is 472778321. The reversal of 472778309 is 903877274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264062500 + 208715809 = 16250^2 + 14447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-472778309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (472778809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 236389154 + 236389155.

It is an arithmetic number, because the mean of its divisors is an integer number (236389155).

Almost surely, 2^472778309 is an apocalyptic number.

It is an amenable number.

472778309 is a deficient number, since it is larger than the sum of its proper divisors (1).

472778309 is an equidigital number, since it uses as much as digits as its factorization.

472778309 is an evil number, because the sum of its binary digits is even.

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

The square root of 472778309 is about 21743.4658920789. The cubic root of 472778309 is about 779.0270077859.

The spelling of 472778309 in words is "four hundred seventy-two million, seven hundred seventy-eight thousand, three hundred nine".