581312057 has 4 divisors (see below), whose sum is σ = 582005760. Its totient is φ = 580618356.

The previous prime is 581312029. The next prime is 581312071. The reversal of 581312057 is 750213185.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 750213185 = 5 ⋅150042637.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581312057 is a prime.

It is a super-2 number, since 2×581312057² = 675847415227142498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (581312077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345593 + ... + 347270.

It is an arithmetic number, because the mean of its divisors is an integer number (145501440).

Almost surely, 2^581312057 is an apocalyptic number.

It is an amenable number.

581312057 is a deficient number, since it is larger than the sum of its proper divisors (693703).

581312057 is an equidigital number, since it uses as much as digits as its factorization.

581312057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693702.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 581312057 is about 24110.4138703590. The cubic root of 581312057 is about 834.5834665780.

The spelling of 581312057 in words is "five hundred eighty-one million, three hundred twelve thousand, fifty-seven".