12149940881 has 4 divisors (see below), whose sum is σ = 13084551732. Its totient is φ = 11215330032.

The previous prime is 12149940853. The next prime is 12149940883. The reversal of 12149940881 is 18804994121.

It is a happy number.

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 917120656 + 11232820225 = 30284^2 + 105985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12149940881 is a prime.

It is a super-2 number, since 2×12149940881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12149940883) 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, 467305406 + ... + 467305431.

It is an arithmetic number, because the mean of its divisors is an integer number (3271137933).

Almost surely, 2^12149940881 is an apocalyptic number.

It is an amenable number.

12149940881 is a deficient number, since it is larger than the sum of its proper divisors (934610851).

12149940881 is an equidigital number, since it uses as much as digits as its factorization.

12149940881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934610850.

The product of its (nonzero) digits is 165888, while the sum is 47.

The spelling of 12149940881 in words is "twelve billion, one hundred forty-nine million, nine hundred forty thousand, eight hundred eighty-one".