780105317 has 2 divisors, whose sum is σ = 780105318. Its totient is φ = 780105316.

The previous prime is 780105289. The next prime is 780105341. The reversal of 780105317 is 713501087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669308641 + 110796676 = 25871^2 + 10526^2 .

It is a cyclic number.

It is not a de Polignac number, because 780105317 - 2¹⁰ = 780104293 is a prime.

It is a super-2 number, since 2×780105317² = 1217128611223340978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780101317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390052658 + 390052659.

It is an arithmetic number, because the mean of its divisors is an integer number (390052659).

Almost surely, 2^780105317 is an apocalyptic number.

It is an amenable number.

780105317 is a deficient number, since it is larger than the sum of its proper divisors (1).

780105317 is an equidigital number, since it uses as much as digits as its factorization.

780105317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 780105317 is about 27930.3655006518. The cubic root of 780105317 is about 920.5578363130.

The spelling of 780105317 in words is "seven hundred eighty million, one hundred five thousand, three hundred seventeen".