2009040581 has 2 divisors, whose sum is σ = 2009040582. Its totient is φ = 2009040580.

The previous prime is 2009040577. The next prime is 2009040611. The reversal of 2009040581 is 1850409002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1947809956 + 61230625 = 44134^2 + 7825^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009040581 - 2² = 2009040577 is a prime.

It is a super-2 number, since 2×2009040581² = 8072488112209635122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2009040571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004520290 + 1004520291.

It is an arithmetic number, because the mean of its divisors is an integer number (1004520291).

Almost surely, 2^2009040581 is an apocalyptic number.

It is an amenable number.

2009040581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009040581 is an equidigital number, since it uses as much as digits as its factorization.

2009040581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2009040581 is about 44822.3223517033. The cubic root of 2009040581 is about 1261.8165996631.

Adding to 2009040581 its reverse (1850409002), we get a palindrome (3859449583).

The spelling of 2009040581 in words is "two billion, nine million, forty thousand, five hundred eighty-one".