1298139361 has 2 divisors, whose sum is σ = 1298139362. Its totient is φ = 1298139360.

The previous prime is 1298139319. The next prime is 1298139373. The reversal of 1298139361 is 1639318921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1287374400 + 10764961 = 35880^2 + 3281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1298139361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1298139461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649069680 + 649069681.

It is an arithmetic number, because the mean of its divisors is an integer number (649069681).

Almost surely, 2^1298139361 is an apocalyptic number.

It is an amenable number.

1298139361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1298139361 is an equidigital number, since it uses as much as digits as its factorization.

1298139361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 1298139361 is about 36029.7010950688. The cubic root of 1298139361 is about 1090.8719451769.

The spelling of 1298139361 in words is "one billion, two hundred ninety-eight million, one hundred thirty-nine thousand, three hundred sixty-one".