981139 has 2 divisors, whose sum is σ = 981140. Its totient is φ = 981138.

The previous prime is 981137. The next prime is 981151. The reversal of 981139 is 931189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981139 - 2¹ = 981137 is a prime.

Together with 981137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 981139.

It is not a weakly prime, because it can be changed into another prime (981133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490569 + 490570.

It is an arithmetic number, because the mean of its divisors is an integer number (490570).

2⁹⁸¹¹³⁹ is an apocalyptic number.

981139 is a deficient number, since it is larger than the sum of its proper divisors (1).

981139 is an equidigital number, since it uses as much as digits as its factorization.

981139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 981139 is about 990.5246084778. The cubic root of 981139 is about 99.3673054180.

The spelling of 981139 in words is "nine hundred eighty-one thousand, one hundred thirty-nine".