1839910981 has 2 divisors, whose sum is σ = 1839910982. Its totient is φ = 1839910980.

The previous prime is 1839910949. The next prime is 1839911009. The reversal of 1839910981 is 1890199381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1758460356 + 81450625 = 41934^2 + 9025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1839910981 - 2⁵ = 1839910949 is a prime.

It is a super-2 number, since 2×1839910981² = 6770544836008764722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1839910781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919955490 + 919955491.

It is an arithmetic number, because the mean of its divisors is an integer number (919955491).

Almost surely, 2^1839910981 is an apocalyptic number.

It is an amenable number.

1839910981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1839910981 is an equidigital number, since it uses as much as digits as its factorization.

1839910981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 49.

The square root of 1839910981 is about 42894.1835334349. The cubic root of 1839910981 is about 1225.3653733938.

The spelling of 1839910981 in words is "one billion, eight hundred thirty-nine million, nine hundred ten thousand, nine hundred eighty-one".