981538 has 4 divisors (see below), whose sum is σ = 1472310. Its totient is φ = 490768.

The previous prime is 981527. The next prime is 981569. The reversal of 981538 is 835189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835189 = 43 ⋅19423.

It can be written as a sum of positive squares in only one way, i.e., 613089 + 368449 = 783^2 + 607^2 .

It is an unprimeable number.

981538 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245383 + ... + 245386.

2⁹⁸¹⁵³⁸ is an apocalyptic number.

981538 is a deficient number, since it is larger than the sum of its proper divisors (490772).

981538 is a wasteful number, since it uses less digits than its factorization.

981538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490771.

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

The square root of 981538 is about 990.7259964289. The cubic root of 981538 is about 99.3807735000.

The spelling of 981538 in words is "nine hundred eighty-one thousand, five hundred thirty-eight".