861211112169 has 32 divisors (see below), whose sum is σ = 1158400224000. Its totient is φ = 569107123200.

The previous prime is 861211112161. The next prime is 861211112171. The reversal of 861211112169 is 961211112168.

It is not a de Polignac number, because 861211112169 - 2³ = 861211112161 is a prime.

It is a super-2 number, since 2×861211112169² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861211112161) 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, 232695019 + ... + 232698719.

It is an arithmetic number, because the mean of its divisors is an integer number (36200007000).

Almost surely, 2^861211112169 is an apocalyptic number.

It is an amenable number.

861211112169 is a deficient number, since it is larger than the sum of its proper divisors (297189111831).

861211112169 is a wasteful number, since it uses less digits than its factorization.

861211112169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5265.

The product of its digits is 10368, while the sum is 39.

Subtracting 861211112169 from its reverse (961211112168), we obtain a palindrome (99999999999).

The spelling of 861211112169 in words is "eight hundred sixty-one billion, two hundred eleven million, one hundred twelve thousand, one hundred sixty-nine".