768444991 has 2 divisors, whose sum is σ = 768444992. Its totient is φ = 768444990.

The previous prime is 768444977. The next prime is 768444997. The reversal of 768444991 is 199444867.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 768444991 - 2¹¹ = 768442943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (768444997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384222495 + 384222496.

It is an arithmetic number, because the mean of its divisors is an integer number (384222496).

Almost surely, 2^768444991 is an apocalyptic number.

768444991 is a deficient number, since it is larger than the sum of its proper divisors (1).

768444991 is an equidigital number, since it uses as much as digits as its factorization.

768444991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The square root of 768444991 is about 27720.8403732643. The cubic root of 768444991 is about 915.9482305652.

The spelling of 768444991 in words is "seven hundred sixty-eight million, four hundred forty-four thousand, nine hundred ninety-one".