11634561 has 6 divisors (see below), whose sum is σ = 16805490. Its totient is φ = 7756368.

The previous prime is 11634559. The next prime is 11634577. The reversal of 11634561 is 16543611.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 1806336 = 3135^2 + 1344^2 .

It is not a de Polignac number, because 11634561 - 2¹ = 11634559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11634361) 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, 646356 + ... + 646373.

It is an arithmetic number, because the mean of its divisors is an integer number (2800915).

Almost surely, 2^11634561 is an apocalyptic number.

It is an amenable number.

11634561 is a deficient number, since it is larger than the sum of its proper divisors (5170929).

11634561 is a wasteful number, since it uses less digits than its factorization.

11634561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292735 (or 1292732 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 11634561 is about 3410.9472291432. The cubic root of 11634561 is about 226.5948318599.

The spelling of 11634561 in words is "eleven million, six hundred thirty-four thousand, five hundred sixty-one".