981087 has 8 divisors (see below), whose sum is σ = 1385136. Its totient is φ = 615552.

The previous prime is 981077. The next prime is 981091. The reversal of 981087 is 780189.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 981087 - 2⁶ = 981023 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9568 + ... + 9669.

It is an arithmetic number, because the mean of its divisors is an integer number (173142).

2⁹⁸¹⁰⁸⁷ is an apocalyptic number.

981087 is a deficient number, since it is larger than the sum of its proper divisors (404049).

981087 is a wasteful number, since it uses less digits than its factorization.

981087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19257.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 981087 is about 990.4983594131. The cubic root of 981087 is about 99.3655499103.

The spelling of 981087 in words is "nine hundred eighty-one thousand, eighty-seven".