581971997 has 4 divisors (see below), whose sum is σ = 582057216. Its totient is φ = 581886780.

The previous prime is 581971993. The next prime is 581972003. The reversal of 581971997 is 799179185.

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.

It is a cyclic number.

It is not a de Polignac number, because 581971997 - 2² = 581971993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581971991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31379 + ... + 46352.

It is an arithmetic number, because the mean of its divisors is an integer number (145514304).

Almost surely, 2^581971997 is an apocalyptic number.

It is an amenable number.

581971997 is a deficient number, since it is larger than the sum of its proper divisors (85219).

581971997 is an equidigital number, since it uses as much as digits as its factorization.

581971997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85218.

The product of its digits is 1428840, while the sum is 56.

The square root of 581971997 is about 24124.0957758006. The cubic root of 581971997 is about 834.8991700592.

The spelling of 581971997 in words is "five hundred eighty-one million, nine hundred seventy-one thousand, nine hundred ninety-seven".