1087981 has 2 divisors, whose sum is σ = 1087982. Its totient is φ = 1087980.

The previous prime is 1087973. The next prime is 1087987. The reversal of 1087981 is 1897801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 885481 + 202500 = 941^2 + 450^2 .

It is an emirp because it is prime and its reverse (1897801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1087981 - 2³ = 1087973 is a prime.

It is a super-2 number, since 2×1087981² = 2367405312722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543990 + 543991.

It is an arithmetic number, because the mean of its divisors is an integer number (543991).

2^1087981 is an apocalyptic number.

It is an amenable number.

1087981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087981 is an equidigital number, since it uses as much as digits as its factorization.

1087981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1087981 is about 1043.0632770834. The cubic root of 1087981 is about 102.8506649176.

The spelling of 1087981 in words is "one million, eighty-seven thousand, nine hundred eighty-one".