1981282139 has 2 divisors, whose sum is σ = 1981282140. Its totient is φ = 1981282138.

The previous prime is 1981282103. The next prime is 1981282157. The reversal of 1981282139 is 9312821891.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9312821891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1981282139 - 2²⁸ = 1712846683 is a prime.

It is a super-3 number, since 3×1981282139³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1981282139.

It is not a weakly prime, because it can be changed into another prime (1981282439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990641069 + 990641070.

It is an arithmetic number, because the mean of its divisors is an integer number (990641070).

Almost surely, 2^1981282139 is an apocalyptic number.

1981282139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981282139 is an equidigital number, since it uses as much as digits as its factorization.

1981282139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 44.

The square root of 1981282139 is about 44511.5955566637. The cubic root of 1981282139 is about 1255.9782194537.

The spelling of 1981282139 in words is "one billion, nine hundred eighty-one million, two hundred eighty-two thousand, one hundred thirty-nine".