861169489 has 4 divisors (see below), whose sum is σ = 866949300. Its totient is φ = 855389680.

The previous prime is 861169483. The next prime is 861169499. The reversal of 861169489 is 984961168.

861169489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 116316225 + 744853264 = 10785^2 + 27292^2 .

It is a cyclic number.

It is not a de Polignac number, because 861169489 - 2⁵ = 861169457 is a prime.

It is a super-2 number, since 2×861169489² = 1483225777569042242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861169483) 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, 2889682 + ... + 2889979.

It is an arithmetic number, because the mean of its divisors is an integer number (216737325).

Almost surely, 2^861169489 is an apocalyptic number.

It is an amenable number.

861169489 is a deficient number, since it is larger than the sum of its proper divisors (5779811).

861169489 is a wasteful number, since it uses less digits than its factorization.

861169489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5779810.

The product of its digits is 746496, while the sum is 52.

The square root of 861169489 is about 29345.6894449594. The cubic root of 861169489 is about 951.3994108808.

The spelling of 861169489 in words is "eight hundred sixty-one million, one hundred sixty-nine thousand, four hundred eighty-nine".