1912163993 has 2 divisors, whose sum is σ = 1912163994. Its totient is φ = 1912163992.

The previous prime is 1912163989. The next prime is 1912163999. The reversal of 1912163993 is 3993612191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1641627289 + 270536704 = 40517^2 + 16448^2 .

It is an emirp because it is prime and its reverse (3993612191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1912163993 - 2² = 1912163989 is a prime.

It is a super-2 number, since 2×1912163993² = 7312742272251408098, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1912163999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956081996 + 956081997.

It is an arithmetic number, because the mean of its divisors is an integer number (956081997).

Almost surely, 2^1912163993 is an apocalyptic number.

It is an amenable number.

1912163993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1912163993 is an equidigital number, since it uses as much as digits as its factorization.

1912163993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 44.

The square root of 1912163993 is about 43728.2973942503. The cubic root of 1912163993 is about 1241.1998430181.

The spelling of 1912163993 in words is "one billion, nine hundred twelve million, one hundred sixty-three thousand, nine hundred ninety-three".