1239082561 has 2 divisors, whose sum is σ = 1239082562. Its totient is φ = 1239082560.

The previous prime is 1239082547. The next prime is 1239082591. The reversal of 1239082561 is 1652809321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622801936 + 616280625 = 24956^2 + 24825^2 .

It is a cyclic number.

It is not a de Polignac number, because 1239082561 - 2⁷ = 1239082433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1239082561.

It is not a weakly prime, because it can be changed into another prime (1239082591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619541280 + 619541281.

It is an arithmetic number, because the mean of its divisors is an integer number (619541281).

Almost surely, 2^1239082561 is an apocalyptic number.

It is an amenable number.

1239082561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239082561 is an equidigital number, since it uses as much as digits as its factorization.

1239082561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1239082561 is about 35200.6045544675. The cubic root of 1239082561 is about 1074.0720489703.

The spelling of 1239082561 in words is "one billion, two hundred thirty-nine million, eighty-two thousand, five hundred sixty-one".