581011213 has 2 divisors, whose sum is σ = 581011214. Its totient is φ = 581011212.

The previous prime is 581011199. The next prime is 581011229. The reversal of 581011213 is 312110185.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579750084 + 1261129 = 24078^2 + 1123^2 .

It is a cyclic number.

It is not a de Polignac number, because 581011213 - 2¹³ = 581003021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581011273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290505606 + 290505607.

It is an arithmetic number, because the mean of its divisors is an integer number (290505607).

Almost surely, 2^581011213 is an apocalyptic number.

It is an amenable number.

581011213 is a deficient number, since it is larger than the sum of its proper divisors (1).

581011213 is an equidigital number, since it uses as much as digits as its factorization.

581011213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 581011213 is about 24104.1741820789. The cubic root of 581011213 is about 834.4394689028.

Adding to 581011213 its reverse (312110185), we get a palindrome (893121398).

The spelling of 581011213 in words is "five hundred eighty-one million, eleven thousand, two hundred thirteen".