1917973793 has 2 divisors, whose sum is σ = 1917973794. Its totient is φ = 1917973792.

The previous prime is 1917973787. The next prime is 1917973817. The reversal of 1917973793 is 3973797191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1761648784 + 156325009 = 41972^2 + 12503^2 .

It is a cyclic number.

It is not a de Polignac number, because 1917973793 - 2¹⁶ = 1917908257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1917973693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958986896 + 958986897.

It is an arithmetic number, because the mean of its divisors is an integer number (958986897).

Almost surely, 2^1917973793 is an apocalyptic number.

It is an amenable number.

1917973793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1917973793 is an equidigital number, since it uses as much as digits as its factorization.

1917973793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250423, while the sum is 56.

The square root of 1917973793 is about 43794.6776789144. The cubic root of 1917973793 is about 1242.4556334736.

The spelling of 1917973793 in words is "one billion, nine hundred seventeen million, nine hundred seventy-three thousand, seven hundred ninety-three".