861506925 has 12 divisors (see below), whose sum is σ = 1424358240. Its totient is φ = 459470320.

The previous prime is 861506869. The next prime is 861506951. The reversal of 861506925 is 529605168.

It is not a de Polignac number, because 861506925 - 2¹⁰ = 861505901 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5743305 + ... + 5743454.

It is an arithmetic number, because the mean of its divisors is an integer number (118696520).

Almost surely, 2^861506925 is an apocalyptic number.

It is an amenable number.

861506925 is a deficient number, since it is larger than the sum of its proper divisors (562851315).

861506925 is a wasteful number, since it uses less digits than its factorization.

861506925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11486772 (or 11486767 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 861506925 is about 29351.4382100775. The cubic root of 861506925 is about 951.5236583890.

The spelling of 861506925 in words is "eight hundred sixty-one million, five hundred six thousand, nine hundred twenty-five".