10979981 has 4 divisors (see below), whose sum is σ = 10987200. Its totient is φ = 10972764.

The previous prime is 10979971. The next prime is 10980029. The reversal of 10979981 is 18997901.

10979981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10979981 - 2¹⁴ = 10963597 is a prime.

It is a super-2 number, since 2×10979981² = 241119965520722, 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 (10979911) 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, 341 + ... + 4698.

It is an arithmetic number, because the mean of its divisors is an integer number (2746800).

Almost surely, 2^10979981 is an apocalyptic number.

It is an amenable number.

10979981 is a deficient number, since it is larger than the sum of its proper divisors (7219).

10979981 is an equidigital number, since it uses as much as digits as its factorization.

10979981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7218.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 10979981 is about 3313.6054381896. The cubic root of 10979981 is about 222.2630124104.

The spelling of 10979981 in words is "ten million, nine hundred seventy-nine thousand, nine hundred eighty-one".