11841561 has 6 divisors (see below), whose sum is σ = 17104490. Its totient is φ = 7894368.

The previous prime is 11841553. The next prime is 11841581. The reversal of 11841561 is 16514811.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 145161 = 3420^2 + 381^2 .

It is not a de Polignac number, because 11841561 - 2³ = 11841553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11841581) 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, 657856 + ... + 657873.

Almost surely, 2^11841561 is an apocalyptic number.

It is an amenable number.

11841561 is a deficient number, since it is larger than the sum of its proper divisors (5262929).

11841561 is a wasteful number, since it uses less digits than its factorization.

11841561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315735 (or 1315732 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 11841561 is about 3441.1569275463. The cubic root of 11841561 is about 227.9307846225.

The spelling of 11841561 in words is "eleven million, eight hundred forty-one thousand, five hundred sixty-one".