11561401 has 4 divisors (see below), whose sum is σ = 11960100. Its totient is φ = 11162704.

The previous prime is 11561371. The next prime is 11561423. The reversal of 11561401 is 10416511.

11561401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10416511 = 7 ⋅1488073.

It can be written as a sum of positive squares in 2 ways, for example, as 7420176 + 4141225 = 2724^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 11561401 - 2¹⁷ = 11430329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199306 + ... + 199363.

It is an arithmetic number, because the mean of its divisors is an integer number (2990025).

Almost surely, 2^11561401 is an apocalyptic number.

It is an amenable number.

11561401 is a deficient number, since it is larger than the sum of its proper divisors (398699).

11561401 is an equidigital number, since it uses as much as digits as its factorization.

11561401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398698.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 11561401 is about 3400.2060231698. The cubic root of 11561401 is about 226.1188778608.

Adding to 11561401 its reverse (10416511), we get a palindrome (21977912).

It can be divided in two parts, 115 and 61401, that added together give a palindrome (61516).

The spelling of 11561401 in words is "eleven million, five hundred sixty-one thousand, four hundred one".