861999367 has 4 divisors (see below), whose sum is σ = 878263560. Its totient is φ = 845735176.

The previous prime is 861999349. The next prime is 861999373. The reversal of 861999367 is 763999168.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861999367 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 (861999337) 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, 8132017 + ... + 8132122.

It is an arithmetic number, because the mean of its divisors is an integer number (219565890).

Almost surely, 2^861999367 is an apocalyptic number.

861999367 is a deficient number, since it is larger than the sum of its proper divisors (16264193).

861999367 is a wasteful number, since it uses less digits than its factorization.

861999367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16264192.

The product of its digits is 4408992, while the sum is 58.

The square root of 861999367 is about 29359.8257317716. The cubic root of 861999367 is about 951.7049225395.

The spelling of 861999367 in words is "eight hundred sixty-one million, nine hundred ninety-nine thousand, three hundred sixty-seven".