2064840581 has 2 divisors, whose sum is σ = 2064840582. Its totient is φ = 2064840580.

The previous prime is 2064840539. The next prime is 2064840619. The reversal of 2064840581 is 1850484602.

It is a happy number.

It is an a-pointer prime, because the next prime (2064840619) can be obtained adding 2064840581 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2031304900 + 33535681 = 45070^2 + 5791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2064840581 is a prime.

It is a super-2 number, since 2×2064840581² = 8527133249888835122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2064840511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1032420290 + 1032420291.

It is an arithmetic number, because the mean of its divisors is an integer number (1032420291).

Almost surely, 2^2064840581 is an apocalyptic number.

It is an amenable number.

2064840581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2064840581 is an equidigital number, since it uses as much as digits as its factorization.

2064840581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 2064840581 is about 45440.5169534855. The cubic root of 2064840581 is about 1273.3921716474.

The spelling of 2064840581 in words is "two billion, sixty-four million, eight hundred forty thousand, five hundred eighty-one".