861685007 has 4 divisors (see below), whose sum is σ = 861827856. Its totient is φ = 861542160.

The previous prime is 861684953. The next prime is 861685031. The reversal of 861685007 is 700586168.

861685007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861685007 - 2¹⁶ = 861619471 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 (861685507) 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, 61958 + ... + 74579.

It is an arithmetic number, because the mean of its divisors is an integer number (215456964).

Almost surely, 2^861685007 is an apocalyptic number.

861685007 is a deficient number, since it is larger than the sum of its proper divisors (142849).

861685007 is a wasteful number, since it uses less digits than its factorization.

861685007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142848.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 861685007 is about 29354.4716695770. The cubic root of 861685007 is about 951.5892169883.

The spelling of 861685007 in words is "eight hundred sixty-one million, six hundred eighty-five thousand, seven".