861256341 has 96 divisors (see below), whose sum is σ = 1470873600. Its totient is φ = 497296800.

The previous prime is 861256327. The next prime is 861256369. The reversal of 861256341 is 143652168.

It is a happy number.

861256341 is a `hidden beast` number, since 8 + 6 + 12 + 5 + 634 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-861256341 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 861256296 and 861256305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861256381) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 10901940 + ... + 10902018.

It is an arithmetic number, because the mean of its divisors is an integer number (15321600).

Almost surely, 2^861256341 is an apocalyptic number.

It is an amenable number.

861256341 is a deficient number, since it is larger than the sum of its proper divisors (609617259).

861256341 is a wasteful number, since it uses less digits than its factorization.

861256341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 211 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 861256341 is about 29347.1692161271. The cubic root of 861256341 is about 951.4313938082.

The spelling of 861256341 in words is "eight hundred sixty-one million, two hundred fifty-six thousand, three hundred forty-one".