11561557 has 8 divisors (see below), whose sum is σ = 13908800. Its totient is φ = 9388224.

The previous prime is 11561531. The next prime is 11561591. The reversal of 11561557 is 75516511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11561557 - 2¹⁹ = 11037269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561507) 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 7 ways as a sum of consecutive naturals, for example, 43332 + ... + 43597.

It is an arithmetic number, because the mean of its divisors is an integer number (1738600).

Almost surely, 2^11561557 is an apocalyptic number.

It is an amenable number.

11561557 is a deficient number, since it is larger than the sum of its proper divisors (2347243).

11561557 is an equidigital number, since it uses as much as digits as its factorization.

11561557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86955.

The product of its digits is 5250, while the sum is 31.

The square root of 11561557 is about 3400.2289628788. The cubic root of 11561557 is about 226.1198948768.

The spelling of 11561557 in words is "eleven million, five hundred sixty-one thousand, five hundred fifty-seven".