768861281 has 2 divisors, whose sum is σ = 768861282. Its totient is φ = 768861280.

The previous prime is 768861271. The next prime is 768861283. The reversal of 768861281 is 182168867.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431808400 + 337052881 = 20780^2 + 18359^2 .

It is an emirp because it is prime and its reverse (182168867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 768861281 - 2⁶ = 768861217 is a prime.

It is a super-2 number, since 2×768861281² = 1182295338841921922, which contains 22 as substring.

Together with 768861283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (768861283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384430640 + 384430641.

It is an arithmetic number, because the mean of its divisors is an integer number (384430641).

Almost surely, 2^768861281 is an apocalyptic number.

It is an amenable number.

768861281 is a deficient number, since it is larger than the sum of its proper divisors (1).

768861281 is an equidigital number, since it uses as much as digits as its factorization.

768861281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 47.

The square root of 768861281 is about 27728.3479673781. The cubic root of 768861281 is about 916.1135997025.

The spelling of 768861281 in words is "seven hundred sixty-eight million, eight hundred sixty-one thousand, two hundred eighty-one".