988581 has 16 divisors (see below), whose sum is σ = 1488960. Its totient is φ = 577920.

The previous prime is 988579. The next prime is 988583. The reversal of 988581 is 185889.

It is an interprime number because it is at equal distance from previous prime (988579) and next prime (988583).

It is not a de Polignac number, because 988581 - 2¹ = 988579 is a prime.

It is a super-2 number, since 2×988581² = 1954584787122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 988581.

It is not an unprimeable number, because it can be changed into a prime (988583) 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 in 15 ways as a sum of consecutive naturals, for example, 441 + ... + 1473.

It is an arithmetic number, because the mean of its divisors is an integer number (93060).

2⁹⁸⁸⁵⁸¹ is an apocalyptic number.

It is an amenable number.

988581 is a deficient number, since it is larger than the sum of its proper divisors (500379).

988581 is a wasteful number, since it uses less digits than its factorization.

988581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its digits is 23040, while the sum is 39.

The square root of 988581 is about 994.2741070751. The cubic root of 988581 is about 99.6179085876.

The spelling of 988581 in words is "nine hundred eighty-eight thousand, five hundred eighty-one".