981583 has 8 divisors (see below), whose sum is σ = 1013760. Its totient is φ = 950040.

The previous prime is 981577. The next prime is 981587. The reversal of 981583 is 385189.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981587) 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, 7428 + ... + 7558.

It is an arithmetic number, because the mean of its divisors is an integer number (126720).

2⁹⁸¹⁵⁸³ is an apocalyptic number.

981583 is a deficient number, since it is larger than the sum of its proper divisors (32177).

981583 is a wasteful number, since it uses less digits than its factorization.

981583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317.

The product of its digits is 8640, while the sum is 34.

The square root of 981583 is about 990.7487067869. The cubic root of 981583 is about 99.3822922276.

It can be divided in two parts, 98 and 1583, that added together give a square (1681 = 41²).

The spelling of 981583 in words is "nine hundred eighty-one thousand, five hundred eighty-three".