11121961 has 4 divisors (see below), whose sum is σ = 11776212. Its totient is φ = 10467712.

The previous prime is 11121959. The next prime is 11121977. The reversal of 11121961 is 16912111.

11121961 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 an emirpimes, since its reverse is a distinct semiprime: 16912111 = 997 ⋅16963.

It can be written as a sum of positive squares in 2 ways, for example, as 10208025 + 913936 = 3195^2 + 956^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121961 - 2¹ = 11121959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121661) 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, 327100 + ... + 327133.

It is an arithmetic number, because the mean of its divisors is an integer number (2944053).

Almost surely, 2^11121961 is an apocalyptic number.

It is an amenable number.

11121961 is a deficient number, since it is larger than the sum of its proper divisors (654251).

11121961 is an equidigital number, since it uses as much as digits as its factorization.

11121961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654250.

The product of its digits is 108, while the sum is 22.

The square root of 11121961 is about 3334.9604195552. The cubic root of 11121961 is about 223.2169257964.

The spelling of 11121961 in words is "eleven million, one hundred twenty-one thousand, nine hundred sixty-one".