861611331 has 8 divisors (see below), whose sum is σ = 1312931584. Its totient is φ = 492349320.

The previous prime is 861611291. The next prime is 861611347. The reversal of 861611331 is 133116168.

861611331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 861611331 - 2¹⁴ = 861594947 is a prime.

It is a super-2 number, since 2×861611331² = 1484748171415183122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861616331) 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, 20514535 + ... + 20514576.

It is an arithmetic number, because the mean of its divisors is an integer number (164116448).

Almost surely, 2^861611331 is an apocalyptic number.

861611331 is a deficient number, since it is larger than the sum of its proper divisors (451320253).

861611331 is a wasteful number, since it uses less digits than its factorization.

861611331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41029121.

The product of its digits is 2592, while the sum is 30.

The square root of 861611331 is about 29353.2167061806. The cubic root of 861611331 is about 951.5620952115.

Adding to 861611331 its reverse (133116168), we get a palindrome (994727499).

The spelling of 861611331 in words is "eight hundred sixty-one million, six hundred eleven thousand, three hundred thirty-one".