785197561 has 4 divisors (see below), whose sum is σ = 787722624. Its totient is φ = 782672500.

The previous prime is 785197559. The next prime is 785197571. The reversal of 785197561 is 165791587.

It is a happy number.

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 785197561 - 2¹ = 785197559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (785197571) 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, 1262065 + ... + 1262686.

It is an arithmetic number, because the mean of its divisors is an integer number (196930656).

Almost surely, 2^785197561 is an apocalyptic number.

It is an amenable number.

785197561 is a deficient number, since it is larger than the sum of its proper divisors (2525063).

785197561 is a wasteful number, since it uses less digits than its factorization.

785197561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525062.

The product of its digits is 529200, while the sum is 49.

The square root of 785197561 is about 28021.3768576778. The cubic root of 785197561 is about 922.5565160500.

The spelling of 785197561 in words is "seven hundred eighty-five million, one hundred ninety-seven thousand, five hundred sixty-one".