2312561 has 4 divisors (see below), whose sum is σ = 2448612. Its totient is φ = 2176512.

The previous prime is 2312539. The next prime is 2312573. The reversal of 2312561 is 1652132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 712336 + 1600225 = 844^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 2312561 - 2¹⁰ = 2311537 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2312521) 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, 68000 + ... + 68033.

It is an arithmetic number, because the mean of its divisors is an integer number (612153).

2^2312561 is an apocalyptic number.

It is an amenable number.

2312561 is a deficient number, since it is larger than the sum of its proper divisors (136051).

2312561 is a wasteful number, since it uses less digits than its factorization.

2312561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136050.

The product of its digits is 360, while the sum is 20.

The square root of 2312561 is about 1520.7106891187. The cubic root of 2312561 is about 132.2404745600.

Adding to 2312561 its reverse (1652132), we get a palindrome (3964693).

The spelling of 2312561 in words is "two million, three hundred twelve thousand, five hundred sixty-one".