1381453952509 has 2 divisors, whose sum is σ = 1381453952510. Its totient is φ = 1381453952508.

The previous prime is 1381453952471. The next prime is 1381453952603. The reversal of 1381453952509 is 9052593541831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1121792367609 + 259661584900 = 1059147^2 + 509570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381453952509 - 2¹⁷ = 1381453821437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1381453952509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381453962509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690726976254 + 690726976255.

It is an arithmetic number, because the mean of its divisors is an integer number (690726976255).

Almost surely, 2^{1381453952509} is an apocalyptic number.

It is an amenable number.

1381453952509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381453952509 is an equidigital number, since it uses as much as digits as its factorization.

1381453952509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832000, while the sum is 55.

The spelling of 1381453952509 in words is "one trillion, three hundred eighty-one billion, four hundred fifty-three million, nine hundred fifty-two thousand, five hundred nine".