2061226561 has 4 divisors (see below), whose sum is σ = 2084386500. Its totient is φ = 2038066624.

The previous prime is 2061226553. The next prime is 2061226567. The reversal of 2061226561 is 1656221602.

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 1376410000 + 684816561 = 37100^2 + 26169^2 .

It is a cyclic number.

It is not a de Polignac number, because 2061226561 - 2³ = 2061226553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2061226567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11579836 + ... + 11580013.

It is an arithmetic number, because the mean of its divisors is an integer number (521096625).

Almost surely, 2^2061226561 is an apocalyptic number.

It is an amenable number.

2061226561 is a deficient number, since it is larger than the sum of its proper divisors (23159939).

2061226561 is an equidigital number, since it uses as much as digits as its factorization.

2061226561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23159938.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2061226561 is about 45400.7330447428. The cubic root of 2061226561 is about 1272.6488128335.

The spelling of 2061226561 in words is "two billion, sixty-one million, two hundred twenty-six thousand, five hundred sixty-one".