860009561 has 4 divisors (see below), whose sum is σ = 861206400. Its totient is φ = 858812724.

The previous prime is 860009551. The next prime is 860009573. The reversal of 860009561 is 165900068.

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 860009561 - 2⁶ = 860009497 is a prime.

It is a super-2 number, since 2×860009561² = 1479232890022825442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (860009531) 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, 597341 + ... + 598778.

It is an arithmetic number, because the mean of its divisors is an integer number (215301600).

Almost surely, 2^860009561 is an apocalyptic number.

It is an amenable number.

860009561 is a deficient number, since it is larger than the sum of its proper divisors (1196839).

860009561 is a wasteful number, since it uses less digits than its factorization.

860009561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196838.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 860009561 is about 29325.9196104743. The cubic root of 860009561 is about 950.9720654052.

The spelling of 860009561 in words is "eight hundred sixty million, nine thousand, five hundred sixty-one".