12091861369 has 27 divisors (see below), whose sum is σ = 14725760133. Its totient is φ = 9899309112.

The previous prime is 12091861363. The next prime is 12091861393. The reversal of 12091861369 is 96316819021.

The square root of 12091861369 is 109963.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 12091861369 - 2⁷ = 12091861241 is a prime.

It is a super-2 number, since 2×12091861369² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12091861363) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 17703702 + ... + 17704384.

Almost surely, 2^12091861369 is an apocalyptic number.

12091861369 is the 109963-rd square number.

12091861369 is the 54982-nd centered octagonal number.

It is an amenable number.

12091861369 is a deficient number, since it is larger than the sum of its proper divisors (2633898764).

12091861369 is an frugal number, since it uses more digits than its factorization.

12091861369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 12091861369 in words is "twelve billion, ninety-one million, eight hundred sixty-one thousand, three hundred sixty-nine".