581138081 has 4 divisors (see below), whose sum is σ = 615322692. Its totient is φ = 546953472.

The previous prime is 581138039. The next prime is 581138083. The reversal of 581138081 is 180831185.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180831185 = 5 ⋅36166237.

It can be written as a sum of positive squares in 2 ways, for example, as 415140625 + 165997456 = 20375^2 + 12884^2 .

It is a cyclic number.

It is not a de Polignac number, because 581138081 - 2⁶ = 581138017 is a prime.

It is a super-2 number, since 2×581138081² = 675442938376725122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (581138083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17092280 + ... + 17092313.

It is an arithmetic number, because the mean of its divisors is an integer number (153830673).

Almost surely, 2^581138081 is an apocalyptic number.

It is an amenable number.

581138081 is a deficient number, since it is larger than the sum of its proper divisors (34184611).

581138081 is a wasteful number, since it uses less digits than its factorization.

581138081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34184610.

The product of its (nonzero) digits is 7680, while the sum is 35.

The square root of 581138081 is about 24106.8056988063. The cubic root of 581138081 is about 834.5001997802.

The spelling of 581138081 in words is "five hundred eighty-one million, one hundred thirty-eight thousand, eighty-one".