11981461 has 4 divisors (see below), whose sum is σ = 12050892. Its totient is φ = 11912032.

The previous prime is 11981443. The next prime is 11981587. The reversal of 11981461 is 16418911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16418911 = 173 ⋅94907.

It can be written as a sum of positive squares in 2 ways, for example, as 10278436 + 1703025 = 3206^2 + 1305^2 .

It is a cyclic number.

It is not a de Polignac number, because 11981461 - 2⁵ = 11981429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981161) 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 3 ways as a sum of consecutive naturals, for example, 34456 + ... + 34801.

It is an arithmetic number, because the mean of its divisors is an integer number (3012723).

Almost surely, 2^11981461 is an apocalyptic number.

It is an amenable number.

11981461 is a deficient number, since it is larger than the sum of its proper divisors (69431).

11981461 is an equidigital number, since it uses as much as digits as its factorization.

11981461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69430.

The product of its digits is 1728, while the sum is 31.

The square root of 11981461 is about 3461.4247066779. The cubic root of 11981461 is about 228.8248885362.

The spelling of 11981461 in words is "eleven million, nine hundred eighty-one thousand, four hundred sixty-one".