981565 has 8 divisors (see below), whose sum is σ = 1268568. Its totient is φ = 724800.

The previous prime is 981527. The next prime is 981569. The reversal of 981565 is 565189.

It can be written as a sum of positive squares in 4 ways, for example, as 7396 + 974169 = 86^2 + 987^2 .

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

It is not a de Polignac number, because 981565 - 2⁷ = 981437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981569) 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, 7486 + ... + 7615.

It is an arithmetic number, because the mean of its divisors is an integer number (158571).

2⁹⁸¹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

981565 is a deficient number, since it is larger than the sum of its proper divisors (287003).

981565 is a wasteful number, since it uses less digits than its factorization.

981565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15119.

The product of its digits is 10800, while the sum is 34.

The square root of 981565 is about 990.7396227062. The cubic root of 981565 is about 99.3816847421.

The spelling of 981565 in words is "nine hundred eighty-one thousand, five hundred sixty-five".