2150561 has 6 divisors (see below), whose sum is σ = 2501730. Its totient is φ = 1843296.

The previous prime is 2150543. The next prime is 2150567. The reversal of 2150561 is 1650512.

It can be written as a sum of positive squares in only one way, i.e., 2119936 + 30625 = 1456^2 + 175^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2150561 is a prime.

It is a super-2 number, since 2×2150561² = 9249825229442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2150567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21896 + ... + 21993.

It is an arithmetic number, because the mean of its divisors is an integer number (416955).

2^2150561 is an apocalyptic number.

It is an amenable number.

2150561 is a deficient number, since it is larger than the sum of its proper divisors (351169).

2150561 is an equidigital number, since it uses as much as digits as its factorization.

2150561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43903 (or 43896 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2150561 is about 1466.4791167964. The cubic root of 2150561 is about 129.0775128567.

The spelling of 2150561 in words is "two million, one hundred fifty thousand, five hundred sixty-one".