2023561 has 4 divisors (see below), whose sum is σ = 2142612. Its totient is φ = 1904512.

The previous prime is 2023547. The next prime is 2023577. The reversal of 2023561 is 1653202.

It is a happy number.

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 1452025 + 571536 = 1205^2 + 756^2 .

It is a cyclic number.

It is not a de Polignac number, because 2023561 - 2⁵ = 2023529 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 0 + 2¹¹ + 3⁹ + 5⁹ + 6⁶ + 1 .

It is not an unprimeable number, because it can be changed into a prime (2023501) 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, 59500 + ... + 59533.

It is an arithmetic number, because the mean of its divisors is an integer number (535653).

2^2023561 is an apocalyptic number.

It is an amenable number.

2023561 is a deficient number, since it is larger than the sum of its proper divisors (119051).

2023561 is a wasteful number, since it uses less digits than its factorization.

2023561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119050.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2023561 is about 1422.5192441581. The cubic root of 2023561 is about 126.4849248024.

Adding to 2023561 its reverse (1653202), we get a palindrome (3676763).

The spelling of 2023561 in words is "two million, twenty-three thousand, five hundred sixty-one".