11601561 has 8 divisors (see below), whose sum is σ = 15492640. Its totient is φ = 7722432.

The previous prime is 11601559. The next prime is 11601563. The reversal of 11601561 is 16510611.

It is an interprime number because it is at equal distance from previous prime (11601559) and next prime (11601563).

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

It is not a de Polignac number, because 11601561 - 2¹ = 11601559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11601563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400 + ... + 4833.

It is an arithmetic number, because the mean of its divisors is an integer number (1936580).

Almost surely, 2^11601561 is an apocalyptic number.

It is an amenable number.

11601561 is a deficient number, since it is larger than the sum of its proper divisors (3891079).

11601561 is an equidigital number, since it uses as much as digits as its factorization.

11601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5975.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 11601561 is about 3406.1064281669. The cubic root of 11601561 is about 226.3803928735.

The spelling of 11601561 in words is "eleven million, six hundred one thousand, five hundred sixty-one".