11561051 has 4 divisors (see below), whose sum is σ = 11733672. Its totient is φ = 11388432.

The previous prime is 11561027. The next prime is 11561087. The reversal of 11561051 is 15016511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15016511 = 263 ⋅57097.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11561051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86210 + ... + 86343.

It is an arithmetic number, because the mean of its divisors is an integer number (2933418).

Almost surely, 2^11561051 is an apocalyptic number.

11561051 is a deficient number, since it is larger than the sum of its proper divisors (172621).

11561051 is an equidigital number, since it uses as much as digits as its factorization.

11561051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172620.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 11561051 is about 3400.1545553107. The cubic root of 11561051 is about 226.1165960611.

Adding to 11561051 its reverse (15016511), we get a palindrome (26577562).

The spelling of 11561051 in words is "eleven million, five hundred sixty-one thousand, fifty-one".