2011250561 has 2 divisors, whose sum is σ = 2011250562. Its totient is φ = 2011250560.

The previous prime is 2011250533. The next prime is 2011250597. The reversal of 2011250561 is 1650521102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2003099536 + 8151025 = 44756^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011250561 - 2²² = 2007056257 is a prime.

It is not a weakly prime, because it can be changed into another prime (2011250261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005625280 + 1005625281.

It is an arithmetic number, because the mean of its divisors is an integer number (1005625281).

Almost surely, 2^2011250561 is an apocalyptic number.

It is an amenable number.

2011250561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011250561 is an equidigital number, since it uses as much as digits as its factorization.

2011250561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 2011250561 is about 44846.9682475861. The cubic root of 2011250561 is about 1262.2791036066.

Adding to 2011250561 its reverse (1650521102), we get a palindrome (3661771663).

The spelling of 2011250561 in words is "two billion, eleven million, two hundred fifty thousand, five hundred sixty-one".