785187128413 has 2 divisors, whose sum is σ = 785187128414. Its totient is φ = 785187128412.

The previous prime is 785187128393. The next prime is 785187128447. The reversal of 785187128413 is 314821781587.

785187128413 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 can be written as a sum of positive squares in only one way, i.e., 675902669689 + 109284458724 = 822133^2 + 330582^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-785187128413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (785187128513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392593564206 + 392593564207.

It is an arithmetic number, because the mean of its divisors is an integer number (392593564207).

Almost surely, 2^785187128413 is an apocalyptic number.

It is an amenable number.

785187128413 is a deficient number, since it is larger than the sum of its proper divisors (1).

785187128413 is an equidigital number, since it uses as much as digits as its factorization.

785187128413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3010560, while the sum is 55.

The spelling of 785187128413 in words is "seven hundred eighty-five billion, one hundred eighty-seven million, one hundred twenty-eight thousand, four hundred thirteen".