581319997 has 2 divisors, whose sum is σ = 581319998. Its totient is φ = 581319996.

The previous prime is 581319983. The next prime is 581320001. The reversal of 581319997 is 799913185.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384591321 + 196728676 = 19611^2 + 14026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581319997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581314997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290659998 + 290659999.

It is an arithmetic number, because the mean of its divisors is an integer number (290659999).

Almost surely, 2^581319997 is an apocalyptic number.

It is an amenable number.

581319997 is a deficient number, since it is larger than the sum of its proper divisors (1).

581319997 is an equidigital number, since it uses as much as digits as its factorization.

581319997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 52.

The square root of 581319997 is about 24110.5785289362. The cubic root of 581319997 is about 834.5872663516.

The spelling of 581319997 in words is "five hundred eighty-one million, three hundred nineteen thousand, nine hundred ninety-seven".