780905231 has 2 divisors, whose sum is σ = 780905232. Its totient is φ = 780905230.

The previous prime is 780905227. The next prime is 780905261. The reversal of 780905231 is 132509087.

It is a weak prime.

It is an emirp because it is prime and its reverse (132509087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 780905231 - 2² = 780905227 is a prime.

It is a super-2 number, since 2×780905231² = 1219625959606326722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 780905191 and 780905200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780905261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390452615 + 390452616.

It is an arithmetic number, because the mean of its divisors is an integer number (390452616).

Almost surely, 2^780905231 is an apocalyptic number.

780905231 is a deficient number, since it is larger than the sum of its proper divisors (1).

780905231 is an equidigital number, since it uses as much as digits as its factorization.

780905231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 780905231 is about 27944.6816228062. The cubic root of 780905231 is about 920.8723731411.

The spelling of 780905231 in words is "seven hundred eighty million, nine hundred five thousand, two hundred thirty-one".