1339668761 has 2 divisors, whose sum is σ = 1339668762. Its totient is φ = 1339668760.

The previous prime is 1339668719. The next prime is 1339668767. The reversal of 1339668761 is 1678669331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1025280400 + 314388361 = 32020^2 + 17731^2 .

It is an emirp because it is prime and its reverse (1678669331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1339668761 - 2¹⁸ = 1339406617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1339668767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669834380 + 669834381.

It is an arithmetic number, because the mean of its divisors is an integer number (669834381).

Almost surely, 2^1339668761 is an apocalyptic number.

It is an amenable number.

1339668761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1339668761 is an equidigital number, since it uses as much as digits as its factorization.

1339668761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The square root of 1339668761 is about 36601.4857758534. The cubic root of 1339668761 is about 1102.3829225930.

The spelling of 1339668761 in words is "one billion, three hundred thirty-nine million, six hundred sixty-eight thousand, seven hundred sixty-one".