1993051817 has 2 divisors, whose sum is σ = 1993051818. Its totient is φ = 1993051816.

The previous prime is 1993051799. The next prime is 1993051829. The reversal of 1993051817 is 7181503991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1951784041 + 41267776 = 44179^2 + 6424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1993051817 - 2¹⁰ = 1993050793 is a prime.

It is a super-3 number, since 3×1993051817³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1993051847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996525908 + 996525909.

It is an arithmetic number, because the mean of its divisors is an integer number (996525909).

Almost surely, 2^1993051817 is an apocalyptic number.

It is an amenable number.

1993051817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993051817 is an equidigital number, since it uses as much as digits as its factorization.

1993051817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 44.

The square root of 1993051817 is about 44643.6089154988. The cubic root of 1993051817 is about 1258.4603300252.

The spelling of 1993051817 in words is "one billion, nine hundred ninety-three million, fifty-one thousand, eight hundred seventeen".