10981981 has 12 divisors (see below), whose sum is σ = 12001500. Its totient is φ = 10035648.

The previous prime is 10981969. The next prime is 10981987. The reversal of 10981981 is 18918901.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8122500 + 2859481 = 2850^2 + 1691^2 .

It is not a de Polignac number, because 10981981 - 2¹¹ = 10979933 is a prime.

It is a super-2 number, since 2×10981981² = 241207813368722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10981981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10981987) 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 11 ways as a sum of consecutive naturals, for example, 9945 + ... + 10993.

It is an arithmetic number, because the mean of its divisors is an integer number (1000125).

Almost surely, 2^10981981 is an apocalyptic number.

It is an amenable number.

10981981 is a deficient number, since it is larger than the sum of its proper divisors (1019519).

10981981 is a wasteful number, since it uses less digits than its factorization.

10981981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 10981981 is about 3313.9072105296. The cubic root of 10981981 is about 222.2765066365.

The spelling of 10981981 in words is "ten million, nine hundred eighty-one thousand, nine hundred eighty-one".