861289307 has 4 divisors (see below), whose sum is σ = 866446896. Its totient is φ = 856131720.

The previous prime is 861289301. The next prime is 861289339. The reversal of 861289307 is 703982168.

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 861289307 - 2²² = 857095003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861289301) 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, 2578544 + ... + 2578877.

It is an arithmetic number, because the mean of its divisors is an integer number (216611724).

Almost surely, 2^861289307 is an apocalyptic number.

861289307 is a deficient number, since it is larger than the sum of its proper divisors (5157589).

861289307 is a wasteful number, since it uses less digits than its factorization.

861289307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5157588.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 861289307 is about 29347.7308662867. The cubic root of 861289307 is about 951.4435328527.

The spelling of 861289307 in words is "eight hundred sixty-one million, two hundred eighty-nine thousand, three hundred seven".