11611557 has 6 divisors (see below), whose sum is σ = 16772262. Its totient is φ = 7741032.

The previous prime is 11611549. The next prime is 11611559. The reversal of 11611557 is 75511611.

It is a happy number.

11611557 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7667361 + 3944196 = 2769^2 + 1986^2 .

It is not a de Polignac number, because 11611557 - 2³ = 11611549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11611557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11611559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 645078 + ... + 645095.

It is an arithmetic number, because the mean of its divisors is an integer number (2795377).

Almost surely, 2^11611557 is an apocalyptic number.

It is an amenable number.

11611557 is a deficient number, since it is larger than the sum of its proper divisors (5160705).

11611557 is a wasteful number, since it uses less digits than its factorization.

11611557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290179 (or 1290176 counting only the distinct ones).

The product of its digits is 1050, while the sum is 27.

The square root of 11611557 is about 3407.5734768307. The cubic root of 11611557 is about 226.4453912763.

The spelling of 11611557 in words is "eleven million, six hundred eleven thousand, five hundred fifty-seven".