785395561 has 4 divisors (see below), whose sum is σ = 786970000. Its totient is φ = 783821124.

The previous prime is 785395553. The next prime is 785395577. The reversal of 785395561 is 165593587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 785395561 - 2³ = 785395553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (785395511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786471 + ... + 787468.

It is an arithmetic number, because the mean of its divisors is an integer number (196742500).

Almost surely, 2^785395561 is an apocalyptic number.

It is an amenable number.

785395561 is a deficient number, since it is larger than the sum of its proper divisors (1574439).

785395561 is a wasteful number, since it uses less digits than its factorization.

785395561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574438.

The product of its digits is 1134000, while the sum is 49.

The square root of 785395561 is about 28024.9096519507. The cubic root of 785395561 is about 922.6340552780.

It can be divided in two parts, 78539 and 5561, that added together give a square (84100 = 290²).

The spelling of 785395561 in words is "seven hundred eighty-five million, three hundred ninety-five thousand, five hundred sixty-one".