981981 has 48 divisors (see below), whose sum is σ = 1921920. Its totient is φ = 466560.

The previous prime is 981979. The next prime is 981983. The reversal of 981981 is 189189.

It is an interprime number because it is at equal distance from previous prime (981979) and next prime (981983).

It is not a de Polignac number, because 981981 - 2¹ = 981979 is a prime.

It is a super-2 number, since 2×981981² = 1928573368722, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981981.

It is not an unprimeable number, because it can be changed into a prime (981983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8955 + ... + 9063.

It is an arithmetic number, because the mean of its divisors is an integer number (40040).

2⁹⁸¹⁹⁸¹ is an apocalyptic number.

981981 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

981981 is a deficient number, since it is larger than the sum of its proper divisors (939939).

981981 is a wasteful number, since it uses less digits than its factorization.

981981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 143 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 981981 is about 990.9495446288. The cubic root of 981981 is about 99.3957225089.

The spelling of 981981 in words is "nine hundred eighty-one thousand, nine hundred eighty-one".