861768291 has 8 divisors (see below), whose sum is σ = 1151679760. Its totient is φ = 573184512.

The previous prime is 861768253. The next prime is 861768307. The reversal of 861768291 is 192867168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 861768291 - 2⁶ = 861768227 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861768291.

It is not an unprimeable number, because it can be changed into a prime (861768211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330406 + ... + 333003.

It is an arithmetic number, because the mean of its divisors is an integer number (143959970).

Almost surely, 2^861768291 is an apocalyptic number.

861768291 is a deficient number, since it is larger than the sum of its proper divisors (289911469).

861768291 is a wasteful number, since it uses less digits than its factorization.

861768291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663845.

The product of its digits is 290304, while the sum is 48.

The square root of 861768291 is about 29355.8902266649. The cubic root of 861768291 is about 951.6198738225.

The spelling of 861768291 in words is "eight hundred sixty-one million, seven hundred sixty-eight thousand, two hundred ninety-one".