12919861981 has 16 divisors (see below), whose sum is σ = 14008587264. Its totient is φ = 11844814464.

The previous prime is 12919861957. The next prime is 12919862017. The reversal of 12919861981 is 18916891921.

It is a cyclic number.

It is not a de Polignac number, because 12919861981 - 2¹¹ = 12919859933 is a prime.

It is a super-2 number, since 2×12919861981² (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 (12919861901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4651065 + ... + 4653841.

It is an arithmetic number, because the mean of its divisors is an integer number (875536704).

Almost surely, 2^12919861981 is an apocalyptic number.

It is an amenable number.

12919861981 is a deficient number, since it is larger than the sum of its proper divisors (1088725283).

12919861981 is a wasteful number, since it uses less digits than its factorization.

12919861981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100.

The product of its digits is 559872, while the sum is 55.

The spelling of 12919861981 in words is "twelve billion, nine hundred nineteen million, eight hundred sixty-one thousand, nine hundred eighty-one".