581672557 has 2 divisors, whose sum is σ = 581672558. Its totient is φ = 581672556.

The previous prime is 581672551. The next prime is 581672569. The reversal of 581672557 is 755276185.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489781161 + 91891396 = 22131^2 + 9586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581672557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581672551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290836278 + 290836279.

It is an arithmetic number, because the mean of its divisors is an integer number (290836279).

Almost surely, 2^581672557 is an apocalyptic number.

It is an amenable number.

581672557 is a deficient number, since it is larger than the sum of its proper divisors (1).

581672557 is an equidigital number, since it uses as much as digits as its factorization.

581672557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588000, while the sum is 46.

The square root of 581672557 is about 24117.8887342984. Note that the first 3 decimals coincide. The cubic root of 581672557 is about 834.7559529178.

The spelling of 581672557 in words is "five hundred eighty-one million, six hundred seventy-two thousand, five hundred fifty-seven".