581338157 has 2 divisors, whose sum is σ = 581338158. Its totient is φ = 581338156.

The previous prime is 581338141. The next prime is 581338207. The reversal of 581338157 is 751833185.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 540748516 + 40589641 = 23254^2 + 6371^2 .

It is a cyclic number.

It is not a de Polignac number, because 581338157 - 2⁴ = 581338141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581338657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290669078 + 290669079.

It is an arithmetic number, because the mean of its divisors is an integer number (290669079).

Almost surely, 2^581338157 is an apocalyptic number.

It is an amenable number.

581338157 is a deficient number, since it is larger than the sum of its proper divisors (1).

581338157 is an equidigital number, since it uses as much as digits as its factorization.

581338157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 581338157 is about 24110.9551241754. The cubic root of 581338157 is about 834.5959568875.

The spelling of 581338157 in words is "five hundred eighty-one million, three hundred thirty-eight thousand, one hundred fifty-seven".