1087861 has 2 divisors, whose sum is σ = 1087862. Its totient is φ = 1087860.

The previous prime is 1087843. The next prime is 1087873. The reversal of 1087861 is 1687801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 463761 = 790^2 + 681^2 .

It is an emirp because it is prime and its reverse (1687801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1087861 - 2⁵ = 1087829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543930 + 543931.

It is an arithmetic number, because the mean of its divisors is an integer number (543931).

2^1087861 is an apocalyptic number.

It is an amenable number.

1087861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087861 is an equidigital number, since it uses as much as digits as its factorization.

1087861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 1087861 is about 1043.0057526208. The cubic root of 1087861 is about 102.8468834381.

The spelling of 1087861 in words is "one million, eighty-seven thousand, eight hundred sixty-one".