981558 has 40 divisors (see below), whose sum is σ = 2256408. Its totient is φ = 318816.

The previous prime is 981527. The next prime is 981569. The reversal of 981558 is 855189.

It is a super-2 number, since 2×981558² = 1926912214728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

981558 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11785 + ... + 11867.

2⁹⁸¹⁵⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 981558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128204).

981558 is an abundant number, since it is smaller than the sum of its proper divisors (1274850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981558 is a wasteful number, since it uses less digits than its factorization.

981558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 161 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 981558 is about 990.7360899856. The cubic root of 981558 is about 99.3814484957.

The spelling of 981558 in words is "nine hundred eighty-one thousand, five hundred fifty-eight".