780371321 has 2 divisors, whose sum is σ = 780371322. Its totient is φ = 780371320.

The previous prime is 780371303. The next prime is 780371351. The reversal of 780371321 is 123173087.

780371321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602015296 + 178356025 = 24536^2 + 13355^2 .

It is a cyclic number.

It is not a de Polignac number, because 780371321 - 2⁶ = 780371257 is a prime.

It is a super-3 number, since 3×780371321³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (780371351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390185660 + 390185661.

It is an arithmetic number, because the mean of its divisors is an integer number (390185661).

Almost surely, 2^780371321 is an apocalyptic number.

It is an amenable number.

780371321 is a deficient number, since it is larger than the sum of its proper divisors (1).

780371321 is an equidigital number, since it uses as much as digits as its factorization.

780371321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 780371321 is about 27935.1270088396. The cubic root of 780371321 is about 920.6624564773.

The spelling of 780371321 in words is "seven hundred eighty million, three hundred seventy-one thousand, three hundred twenty-one".