785408641 has 2 divisors, whose sum is σ = 785408642. Its totient is φ = 785408640.

The previous prime is 785408633. The next prime is 785408683. The reversal of 785408641 is 146804587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621056241 + 164352400 = 24921^2 + 12820^2 .

It is an emirp because it is prime and its reverse (146804587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 785408641 - 2³ = 785408633 is a prime.

It is not a weakly prime, because it can be changed into another prime (785408621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392704320 + 392704321.

It is an arithmetic number, because the mean of its divisors is an integer number (392704321).

Almost surely, 2^785408641 is an apocalyptic number.

It is an amenable number.

785408641 is a deficient number, since it is larger than the sum of its proper divisors (1).

785408641 is an equidigital number, since it uses as much as digits as its factorization.

785408641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 785408641 is about 28025.1430148001. The cubic root of 785408641 is about 922.6391771075.

The spelling of 785408641 in words is "seven hundred eighty-five million, four hundred eight thousand, six hundred forty-one".