581138087 has 2 divisors, whose sum is σ = 581138088. Its totient is φ = 581138086.

The previous prime is 581138083. The next prime is 581138137. The reversal of 581138087 is 780831185.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 581138087 - 2² = 581138083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581138083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290569043 + 290569044.

It is an arithmetic number, because the mean of its divisors is an integer number (290569044).

Almost surely, 2^581138087 is an apocalyptic number.

581138087 is a deficient number, since it is larger than the sum of its proper divisors (1).

581138087 is an equidigital number, since it uses as much as digits as its factorization.

581138087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 41.

The square root of 581138087 is about 24106.8058232525. The cubic root of 581138087 is about 834.5002026521.

The spelling of 581138087 in words is "five hundred eighty-one million, one hundred thirty-eight thousand, eighty-seven".