988631 has 4 divisors (see below), whose sum is σ = 1129872. Its totient is φ = 847392.

The previous prime is 988607. The next prime is 988643. The reversal of 988631 is 136889.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 988631 - 2¹⁰ = 987607 is a prime.

It is a super-2 number, since 2×988631² = 1954782508322, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 988591 and 988600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988651) 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, 70610 + ... + 70623.

It is an arithmetic number, because the mean of its divisors is an integer number (282468).

2⁹⁸⁸⁶³¹ is an apocalyptic number.

988631 is a deficient number, since it is larger than the sum of its proper divisors (141241).

988631 is a wasteful number, since it uses less digits than its factorization.

988631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141240.

The product of its digits is 10368, while the sum is 35.

The square root of 988631 is about 994.2992507289. The cubic root of 988631 is about 99.6195880357.

The spelling of 988631 in words is "nine hundred eighty-eight thousand, six hundred thirty-one".