1371257321009 has 2 divisors, whose sum is σ = 1371257321010. Its totient is φ = 1371257321008.

The previous prime is 1371257320997. The next prime is 1371257321039. The reversal of 1371257321009 is 9001237521731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1368074104609 + 3183216400 = 1169647^2 + 56420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371257321009 - 2²⁰ = 1371256272433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1371257321039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685628660504 + 685628660505.

It is an arithmetic number, because the mean of its divisors is an integer number (685628660505).

Almost surely, 2^{1371257321009} is an apocalyptic number.

It is an amenable number.

1371257321009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371257321009 is an equidigital number, since it uses as much as digits as its factorization.

1371257321009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 41.

The spelling of 1371257321009 in words is "one trillion, three hundred seventy-one billion, two hundred fifty-seven million, three hundred twenty-one thousand, nine".