11951161 has 4 divisors (see below), whose sum is σ = 12363300. Its totient is φ = 11539024.

The previous prime is 11951143. The next prime is 11951167. The reversal of 11951161 is 16115911.

11951161 = 2444² + 2445².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5973136 + 5978025 = 2444^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 11951161 - 2¹³ = 11942969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11951167) 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, 206026 + ... + 206083.

It is an arithmetic number, because the mean of its divisors is an integer number (3090825).

Almost surely, 2^11951161 is an apocalyptic number.

11951161 is the 2445-th centered square number.

It is an amenable number.

11951161 is a deficient number, since it is larger than the sum of its proper divisors (412139).

11951161 is an equidigital number, since it uses as much as digits as its factorization.

11951161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412138.

The product of its digits is 270, while the sum is 25.

The square root of 11951161 is about 3457.0451255371. The cubic root of 11951161 is about 228.6318334215.

The spelling of 11951161 in words is "eleven million, nine hundred fifty-one thousand, one hundred sixty-one".