11561251 has 4 divisors (see below), whose sum is σ = 12450592. Its totient is φ = 10671912.

The previous prime is 11561237. The next prime is 11561257. The reversal of 11561251 is 15216511.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11561251 - 2⁵ = 11561219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561257) 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, 444651 + ... + 444676.

It is an arithmetic number, because the mean of its divisors is an integer number (3112648).

Almost surely, 2^11561251 is an apocalyptic number.

11561251 is a deficient number, since it is larger than the sum of its proper divisors (889341).

11561251 is an equidigital number, since it uses as much as digits as its factorization.

11561251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889340.

The product of its digits is 300, while the sum is 22.

The square root of 11561251 is about 3400.1839656113. The cubic root of 11561251 is about 226.1178999523.

Adding to 11561251 its reverse (15216511), we get a palindrome (26777762).

The spelling of 11561251 in words is "eleven million, five hundred sixty-one thousand, two hundred fifty-one".