785555879 has 2 divisors, whose sum is σ = 785555880. Its totient is φ = 785555878.

The previous prime is 785555867. The next prime is 785555909. The reversal of 785555879 is 978555587.

It is a weak prime.

It is an emirp because it is prime and its reverse (978555587) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-785555879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (785545879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392777939 + 392777940.

It is an arithmetic number, because the mean of its divisors is an integer number (392777940).

Almost surely, 2^785555879 is an apocalyptic number.

785555879 is a deficient number, since it is larger than the sum of its proper divisors (1).

785555879 is an equidigital number, since it uses as much as digits as its factorization.

785555879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640000, while the sum is 59.

The square root of 785555879 is about 28027.7697828422. The cubic root of 785555879 is about 922.6968282257.

The spelling of 785555879 in words is "seven hundred eighty-five million, five hundred fifty-five thousand, eight hundred seventy-nine".