861745077 has 6 divisors (see below), whose sum is σ = 1244742902. Its totient is φ = 574496712.

The previous prime is 861745051. The next prime is 861745111. The reversal of 861745077 is 770547168.

It can be written as a sum of positive squares in only one way, i.e., 772895601 + 88849476 = 27801^2 + 9426^2 .

It is not a de Polignac number, because 861745077 - 2⁶ = 861745013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861745477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47874718 + ... + 47874735.

Almost surely, 2^861745077 is an apocalyptic number.

It is an amenable number.

861745077 is a deficient number, since it is larger than the sum of its proper divisors (382997825).

861745077 is a wasteful number, since it uses less digits than its factorization.

861745077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95749459 (or 95749456 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 861745077 is about 29355.4948348687. The cubic root of 861745077 is about 951.6113289494.

The spelling of 861745077 in words is "eight hundred sixty-one million, seven hundred forty-five thousand, seventy-seven".