2042551561 has 2 divisors, whose sum is σ = 2042551562. Its totient is φ = 2042551560.

The previous prime is 2042551549. The next prime is 2042551573. The reversal of 2042551561 is 1651552402.

It is a balanced prime because it is at equal distance from previous prime (2042551549) and next prime (2042551573).

It can be written as a sum of positive squares in only one way, i.e., 1828075536 + 214476025 = 42756^2 + 14645^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042551561 - 2¹³ = 2042543369 is a prime.

It is not a weakly prime, because it can be changed into another prime (2042551061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021275780 + 1021275781.

It is an arithmetic number, because the mean of its divisors is an integer number (1021275781).

Almost surely, 2^2042551561 is an apocalyptic number.

It is an amenable number.

2042551561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2042551561 is an equidigital number, since it uses as much as digits as its factorization.

2042551561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 2042551561 is about 45194.5965907430. The cubic root of 2042551561 is about 1268.7936880748.

The spelling of 2042551561 in words is "two billion, forty-two million, five hundred fifty-one thousand, five hundred sixty-one".