581679649 has 2 divisors, whose sum is σ = 581679650. Its totient is φ = 581679648.

The previous prime is 581679617. The next prime is 581679671. The reversal of 581679649 is 946976185.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512207424 + 69472225 = 22632^2 + 8335^2 .

It is a cyclic number.

It is not a de Polignac number, because 581679649 - 2⁵ = 581679617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 581679649.

It is not a weakly prime, because it can be changed into another prime (581679349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290839824 + 290839825.

It is an arithmetic number, because the mean of its divisors is an integer number (290839825).

Almost surely, 2^581679649 is an apocalyptic number.

It is an amenable number.

581679649 is a deficient number, since it is larger than the sum of its proper divisors (1).

581679649 is an equidigital number, since it uses as much as digits as its factorization.

581679649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The square root of 581679649 is about 24118.0357616453. The cubic root of 581679649 is about 834.7593454709.

The spelling of 581679649 in words is "five hundred eighty-one million, six hundred seventy-nine thousand, six hundred forty-nine".