1339924561 has 2 divisors, whose sum is σ = 1339924562. Its totient is φ = 1339924560.

The previous prime is 1339924519. The next prime is 1339924583. The reversal of 1339924561 is 1654299331.

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., 1201038336 + 138886225 = 34656^2 + 11785^2 .

It is an emirp because it is prime and its reverse (1654299331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1339924561 - 2⁷ = 1339924433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1339924661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669962280 + 669962281.

It is an arithmetic number, because the mean of its divisors is an integer number (669962281).

Almost surely, 2^1339924561 is an apocalyptic number.

It is an amenable number.

1339924561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1339924561 is an equidigital number, since it uses as much as digits as its factorization.

1339924561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 43.

The square root of 1339924561 is about 36604.9800027264. The cubic root of 1339924561 is about 1102.4530821264.

The spelling of 1339924561 in words is "one billion, three hundred thirty-nine million, nine hundred twenty-four thousand, five hundred sixty-one".