2133561 has 4 divisors (see below), whose sum is σ = 2844752. Its totient is φ = 1422372.

The previous prime is 2133541. The next prime is 2133563. The reversal of 2133561 is 1653312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2133561 - 2⁷ = 2133433 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2133563) 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, 355591 + ... + 355596.

It is an arithmetic number, because the mean of its divisors is an integer number (711188).

2^2133561 is an apocalyptic number.

It is an amenable number.

2133561 is a deficient number, since it is larger than the sum of its proper divisors (711191).

2133561 is an equidigital number, since it uses as much as digits as its factorization.

2133561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711190.

The product of its digits is 540, while the sum is 21.

The square root of 2133561 is about 1460.6714209568. The cubic root of 2133561 is about 128.7364971543.

Adding to 2133561 its reverse (1653312), we get a palindrome (3786873).

Subtracting from 2133561 its reverse (1653312), we obtain a square (480249 = 693²).

The spelling of 2133561 in words is "two million, one hundred thirty-three thousand, five hundred sixty-one".