11601591 has 16 divisors (see below), whose sum is σ = 16226304. Its totient is φ = 7359264.

The previous prime is 11601581. The next prime is 11601593. The reversal of 11601591 is 19510611.

11601591 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11601591 - 2⁵ = 11601559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11601593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18810 + ... + 19416.

It is an arithmetic number, because the mean of its divisors is an integer number (1014144).

Almost surely, 2^11601591 is an apocalyptic number.

11601591 is the 1821-st nonagonal number.

11601591 is a deficient number, since it is larger than the sum of its proper divisors (4624713).

11601591 is a wasteful number, since it uses less digits than its factorization.

11601591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910.

The product of its (nonzero) digits is 270, while the sum is 24.

The square root of 11601591 is about 3406.1108320194. The cubic root of 11601591 is about 226.3805880025.

The spelling of 11601591 in words is "eleven million, six hundred one thousand, five hundred ninety-one".