988981 has 4 divisors (see below), whose sum is σ = 1130272. Its totient is φ = 847692.

The previous prime is 988979. The next prime is 989011. The reversal of 988981 is 189889.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189889 = 7 ⋅27127.

It is a cyclic number.

It is not a de Polignac number, because 988981 - 2¹ = 988979 is a prime.

It is a super-2 number, since 2×988981² = 1956166836722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988901) 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, 70635 + ... + 70648.

It is an arithmetic number, because the mean of its divisors is an integer number (282568).

2⁹⁸⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

988981 is a deficient number, since it is larger than the sum of its proper divisors (141291).

988981 is a wasteful number, since it uses less digits than its factorization.

988981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141290.

The product of its digits is 41472, while the sum is 43.

The square root of 988981 is about 994.4752385052. The cubic root of 988981 is about 99.6313425872.

The spelling of 988981 in words is "nine hundred eighty-eight thousand, nine hundred eighty-one".