2140204561 has 12 divisors (see below), whose sum is σ = 2368264500. Its totient is φ = 1932566240.

The previous prime is 2140204543. The next prime is 2140204571. The reversal of 2140204561 is 1654020412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 351337536 + 1788867025 = 18744^2 + 42295^2 .

It is not a de Polignac number, because 2140204561 - 2⁵ = 2140204529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2140204571) 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 11 ways as a sum of consecutive naturals, for example, 41326 + ... + 77383.

It is an arithmetic number, because the mean of its divisors is an integer number (197355375).

Almost surely, 2^2140204561 is an apocalyptic number.

It is an amenable number.

2140204561 is a deficient number, since it is larger than the sum of its proper divisors (228059939).

2140204561 is a wasteful number, since it uses less digits than its factorization.

2140204561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118880 (or 118869 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2140204561 is about 46262.3449578596. The cubic root of 2140204561 is about 1288.6998018758.

Adding to 2140204561 its reverse (1654020412), we get a palindrome (3794224973).

The spelling of 2140204561 in words is "two billion, one hundred forty million, two hundred four thousand, five hundred sixty-one".