1916143993 has 2 divisors, whose sum is σ = 1916143994. Its totient is φ = 1916143992.

The previous prime is 1916143981. The next prime is 1916144047. The reversal of 1916143993 is 3993416191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1914675049 + 1468944 = 43757^2 + 1212^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916143993 - 2¹³ = 1916135801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1916143903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958071996 + 958071997.

It is an arithmetic number, because the mean of its divisors is an integer number (958071997).

Almost surely, 2^1916143993 is an apocalyptic number.

It is an amenable number.

1916143993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916143993 is an equidigital number, since it uses as much as digits as its factorization.

1916143993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 46.

The square root of 1916143993 is about 43773.7820276019. The cubic root of 1916143993 is about 1242.0603954215.

The spelling of 1916143993 in words is "one billion, nine hundred sixteen million, one hundred forty-three thousand, nine hundred ninety-three".