861881363 has 32 divisors (see below), whose sum is σ = 1077312000. Its totient is φ = 674648352.

The previous prime is 861881359. The next prime is 861881387. The reversal of 861881363 is 363188168.

861881363 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 861881363 - 2² = 861881359 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861881303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1392068 + ... + 1392686.

It is an arithmetic number, because the mean of its divisors is an integer number (33666000).

Almost surely, 2^861881363 is an apocalyptic number.

861881363 is a deficient number, since it is larger than the sum of its proper divisors (215430637).

861881363 is an equidigital number, since it uses as much as digits as its factorization.

861881363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 674 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 861881363 is about 29357.8160461571. The cubic root of 861881363 is about 951.6614924563.

The spelling of 861881363 in words is "eight hundred sixty-one million, eight hundred eighty-one thousand, three hundred sixty-three".