11661051 has 4 divisors (see below), whose sum is σ = 15548072. Its totient is φ = 7774032.

The previous prime is 11661037. The next prime is 11661059. The reversal of 11661051 is 15016611.

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

It is not a de Polignac number, because 11661051 - 2⁵ = 11661019 is a prime.

It is a super-2 number, since 2×11661051² = 271960220849202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943506 + ... + 1943511.

It is an arithmetic number, because the mean of its divisors is an integer number (3887018).

Almost surely, 2^11661051 is an apocalyptic number.

11661051 is a deficient number, since it is larger than the sum of its proper divisors (3887021).

11661051 is an equidigital number, since it uses as much as digits as its factorization.

11661051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887020.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 11661051 is about 3414.8281069477. The cubic root of 11661051 is about 226.7666746789.

Adding to 11661051 its reverse (15016611), we get a palindrome (26677662).

The spelling of 11661051 in words is "eleven million, six hundred sixty-one thousand, fifty-one".