581731120369 has 9 divisors (see below), whose sum is σ = 676713840537. Its totient is φ = 498622098324.

The previous prime is 581731120367. The next prime is 581731120417. The reversal of 581731120369 is 963021137185.

It is a happy number.

The square root of 581731120369 is 762713.

It is a perfect power (a square), and thus also a powerful number.

581731120369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 581731120369 - 2¹ = 581731120367 is a prime.

It is a super-2 number, since 2×581731120369² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (581731120367) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5284512 + ... + 5393470.

Almost surely, 2^581731120369 is an apocalyptic number.

581731120369 is the 762713-rd square number.

581731120369 is the 381357-th centered octagonal number.

It is an amenable number.

581731120369 is a deficient number, since it is larger than the sum of its proper divisors (94982720168).

581731120369 is an frugal number, since it uses more digits than its factorization.

581731120369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217932 (or 108966 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 581731120369 in words is "five hundred eighty-one billion, seven hundred thirty-one million, one hundred twenty thousand, three hundred sixty-nine".