861647425 has 12 divisors (see below), whose sum is σ = 1069520956. Its totient is φ = 688622400.

The previous prime is 861647419. The next prime is 861647429. The reversal of 861647425 is 524746168.

861647425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1046529 + 860600896 = 1023^2 + 29336^2 .

It is not a de Polignac number, because 861647425 - 2¹¹ = 861645377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861647429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8647 + ... + 42403.

Almost surely, 2^861647425 is an apocalyptic number.

It is an amenable number.

861647425 is a deficient number, since it is larger than the sum of its proper divisors (207873531).

861647425 is a wasteful number, since it uses less digits than its factorization.

861647425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34788 (or 34783 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The square root of 861647425 is about 29353.8315216259. The cubic root of 861647425 is about 951.5753824101.

The spelling of 861647425 in words is "eight hundred sixty-one million, six hundred forty-seven thousand, four hundred twenty-five".