13222787981 has 6 divisors (see below), whose sum is σ = 14318167050. Its totient is φ = 12205650288.

The previous prime is 13222787951. The next prime is 13222787983. The reversal of 13222787981 is 18978722231.

13222787981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 201924100 + 13020863881 = 14210^2 + 114109^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13222787981 is a prime.

It is a super-2 number, since 2×13222787981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13222787983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39120506 + ... + 39120843.

It is an arithmetic number, because the mean of its divisors is an integer number (2386361175).

Almost surely, 2^13222787981 is an apocalyptic number.

It is an amenable number.

13222787981 is a deficient number, since it is larger than the sum of its proper divisors (1095379069).

13222787981 is an equidigital number, since it uses as much as digits as its factorization.

13222787981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78241375 (or 78241362 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The spelling of 13222787981 in words is "thirteen billion, two hundred twenty-two million, seven hundred eighty-seven thousand, nine hundred eighty-one".