1917201381383 has 2 divisors, whose sum is σ = 1917201381384. Its totient is φ = 1917201381382.

The previous prime is 1917201381371. The next prime is 1917201381451. The reversal of 1917201381383 is 3831831027191.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1917201381383 - 2⁴ = 1917201381367 is a prime.

It is a super-2 number, since 2×1917201381383² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1917201381083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958600690691 + 958600690692.

It is an arithmetic number, because the mean of its divisors is an integer number (958600690692).

Almost surely, 2^{1917201381383} is an apocalyptic number.

1917201381383 is a deficient number, since it is larger than the sum of its proper divisors (1).

1917201381383 is an equidigital number, since it uses as much as digits as its factorization.

1917201381383 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 1917201381383 in words is "one trillion, nine hundred seventeen billion, two hundred one million, three hundred eighty-one thousand, three hundred eighty-three".