4135921561 has 2 divisors, whose sum is σ = 4135921562. Its totient is φ = 4135921560.

The previous prime is 4135921549. The next prime is 4135921579. The reversal of 4135921561 is 1651295314.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2932872336 + 1203049225 = 54156^2 + 34685^2 .

It is a cyclic number.

It is not a de Polignac number, because 4135921561 - 2¹⁵ = 4135888793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4135921561.

It is not a weakly prime, because it can be changed into another prime (4135921511) 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 as a sum of consecutive naturals, namely, 2067960780 + 2067960781.

It is an arithmetic number, because the mean of its divisors is an integer number (2067960781).

Almost surely, 2^4135921561 is an apocalyptic number.

It is an amenable number.

4135921561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4135921561 is an equidigital number, since it uses as much as digits as its factorization.

4135921561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 4135921561 is about 64311.1309261468. The cubic root of 4135921561 is about 1605.1813229926.

The spelling of 4135921561 in words is "four billion, one hundred thirty-five million, nine hundred twenty-one thousand, five hundred sixty-one".