981579 has 4 divisors (see below), whose sum is σ = 1308776. Its totient is φ = 654384.

The previous prime is 981577. The next prime is 981587. The reversal of 981579 is 975189.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 975189 = 3 ⋅325063.

It is not a de Polignac number, because 981579 - 2¹ = 981577 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981577) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 163594 + ... + 163599.

It is an arithmetic number, because the mean of its divisors is an integer number (327194).

2⁹⁸¹⁵⁷⁹ is an apocalyptic number.

981579 is a deficient number, since it is larger than the sum of its proper divisors (327197).

981579 is a wasteful number, since it uses less digits than its factorization.

981579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327196.

The product of its digits is 22680, while the sum is 39.

The square root of 981579 is about 990.7466881095. The cubic root of 981579 is about 99.3821572314.

The spelling of 981579 in words is "nine hundred eighty-one thousand, five hundred seventy-nine".