778227881 has 2 divisors, whose sum is σ = 778227882. Its totient is φ = 778227880.

The previous prime is 778227851. The next prime is 778227883. The reversal of 778227881 is 188722877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 542144656 + 236083225 = 23284^2 + 15365^2 .

It is a cyclic number.

It is not a de Polignac number, because 778227881 - 2⁶ = 778227817 is a prime.

It is a super-2 number, since 2×778227881² = 1211277269531500322, which contains 22 as substring.

Together with 778227883, 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 (778227883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389113940 + 389113941.

It is an arithmetic number, because the mean of its divisors is an integer number (389113941).

Almost surely, 2^778227881 is an apocalyptic number.

It is an amenable number.

778227881 is a deficient number, since it is larger than the sum of its proper divisors (1).

778227881 is an equidigital number, since it uses as much as digits as its factorization.

778227881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 702464, while the sum is 50.

The square root of 778227881 is about 27896.7360277148. The cubic root of 778227881 is about 919.8187580118.

The spelling of 778227881 in words is "seven hundred seventy-eight million, two hundred twenty-seven thousand, eight hundred eighty-one".