11914981 has 4 divisors (see below), whose sum is σ = 12831532. Its totient is φ = 10998432.

The previous prime is 11914967. The next prime is 11914993. The reversal of 11914981 is 18941911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18941911 = 109 ⋅173779.

It can be written as a sum of positive squares in 2 ways, for example, as 7650756 + 4264225 = 2766^2 + 2065^2 .

It is a cyclic number.

It is not a de Polignac number, because 11914981 - 2¹¹ = 11912933 is a prime.

It is a super-2 number, since 2×11914981² = 283933544460722, 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 (11914901) 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, 458256 + ... + 458281.

It is an arithmetic number, because the mean of its divisors is an integer number (3207883).

Almost surely, 2^11914981 is an apocalyptic number.

It is an amenable number.

11914981 is a deficient number, since it is larger than the sum of its proper divisors (916551).

11914981 is an equidigital number, since it uses as much as digits as its factorization.

11914981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916550.

The product of its digits is 2592, while the sum is 34.

The square root of 11914981 is about 3451.8083666391. The cubic root of 11914981 is about 228.4008862348.

The spelling of 11914981 in words is "eleven million, nine hundred fourteen thousand, nine hundred eighty-one".