13281956009 has 4 divisors (see below), whose sum is σ = 15179378304. Its totient is φ = 11384533716.

The previous prime is 13281955991. The next prime is 13281956047. The reversal of 13281956009 is 90065918231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90065918231 = 31 ⋅2905352201.

It is a cyclic number.

It is not a de Polignac number, because 13281956009 - 2³² = 8986988713 is a prime.

It is a super-2 number, since 2×13281956009² (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 (13281956089) 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, 948711137 + ... + 948711150.

It is an arithmetic number, because the mean of its divisors is an integer number (3794844576).

Almost surely, 2^13281956009 is an apocalyptic number.

It is an amenable number.

13281956009 is a deficient number, since it is larger than the sum of its proper divisors (1897422295).

13281956009 is an equidigital number, since it uses as much as digits as its factorization.

13281956009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897422294.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 13281956009 in words is "thirteen billion, two hundred eighty-one million, nine hundred fifty-six thousand, nine".