988531 has 4 divisors (see below), whose sum is σ = 990792. Its totient is φ = 986272.

The previous prime is 988511. The next prime is 988541. The reversal of 988531 is 135889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135889 = 13 ⋅10453.

It is a cyclic number.

It is not a de Polignac number, because 988531 - 2¹⁷ = 857459 is a prime.

It is a super-2 number, since 2×988531² = 1954387075922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (988501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241 + ... + 1426.

It is an arithmetic number, because the mean of its divisors is an integer number (247698).

2⁹⁸⁸⁵³¹ is an apocalyptic number.

988531 is a deficient number, since it is larger than the sum of its proper divisors (2261).

988531 is a wasteful number, since it uses less digits than its factorization.

988531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260.

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

The square root of 988531 is about 994.2489627855. The cubic root of 988531 is about 99.6162290829.

The spelling of 988531 in words is "nine hundred eighty-eight thousand, five hundred thirty-one".