780911491 has 2 divisors, whose sum is σ = 780911492. Its totient is φ = 780911490.

The previous prime is 780911489. The next prime is 780911501. The reversal of 780911491 is 194119087.

780911491 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 is a cyclic number.

It is not a de Polignac number, because 780911491 - 2¹ = 780911489 is a prime.

Together with 780911489, it forms a pair of twin primes.

It is a Chen prime.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390455745 + 390455746.

It is an arithmetic number, because the mean of its divisors is an integer number (390455746).

Almost surely, 2^780911491 is an apocalyptic number.

780911491 is a deficient number, since it is larger than the sum of its proper divisors (1).

780911491 is an equidigital number, since it uses as much as digits as its factorization.

780911491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 40.

The square root of 780911491 is about 27944.7936295833. The cubic root of 780911491 is about 920.8748338091.

The spelling of 780911491 in words is "seven hundred eighty million, nine hundred eleven thousand, four hundred ninety-one".