12158811289 has 9 divisors (see below), whose sum is σ = 12567216351. Its totient is φ = 11763283560.

The previous prime is 12158811283. The next prime is 12158811317. The reversal of 12158811289 is 98211885121.

It is a happy number.

The square root of 12158811289 is 110267.

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

It can be written as a sum of positive squares in only one way, i.e., 1489574025 + 10669237264 = 38595^2 + 103292^2 .

It is not a de Polignac number, because 12158811289 - 2²¹ = 12156714137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12158811283) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3416499 + ... + 3420055.

Almost surely, 2^12158811289 is an apocalyptic number.

12158811289 is the 110267-th square number.

12158811289 is the 55134-th centered octagonal number.

It is an amenable number.

12158811289 is a deficient number, since it is larger than the sum of its proper divisors (408405062).

12158811289 is an frugal number, since it uses more digits than its factorization.

12158811289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7176 (or 3588 counting only the distinct ones).

The product of its digits is 92160, while the sum is 46.

The spelling of 12158811289 in words is "twelve billion, one hundred fifty-eight million, eight hundred eleven thousand, two hundred eighty-nine".