11981069 has 4 divisors (see below), whose sum is σ = 11988444. Its totient is φ = 11973696.

The previous prime is 11981059. The next prime is 11981087. The reversal of 11981069 is 96018911.

11981069 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 brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96018911 = 107 ⋅897373.

It can be written as a sum of positive squares in 2 ways, for example, as 11055625 + 925444 = 3325^2 + 962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11981069 is a prime.

It is a super-2 number, since 2×11981069² = 287092028765522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981009) 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, 62 + ... + 4895.

It is an arithmetic number, because the mean of its divisors is an integer number (2997111).

Almost surely, 2^11981069 is an apocalyptic number.

It is an amenable number.

11981069 is a deficient number, since it is larger than the sum of its proper divisors (7375).

11981069 is an equidigital number, since it uses as much as digits as its factorization.

11981069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 11981069 is about 3461.3680821317. The cubic root of 11981069 is about 228.8223930049.

The spelling of 11981069 in words is "eleven million, nine hundred eighty-one thousand, sixty-nine".