1213109993 has 2 divisors, whose sum is σ = 1213109994. Its totient is φ = 1213109992.

The previous prime is 1213109983. The next prime is 1213110013. The reversal of 1213109993 is 3999013121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1212989584 + 120409 = 34828^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213109993 - 2¹⁸ = 1212847849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213109923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606554996 + 606554997.

It is an arithmetic number, because the mean of its divisors is an integer number (606554997).

Almost surely, 2^1213109993 is an apocalyptic number.

It is an amenable number.

1213109993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213109993 is an equidigital number, since it uses as much as digits as its factorization.

1213109993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 1213109993 is about 34829.7285806249. The cubic root of 1213109993 is about 1066.5144076400.

The spelling of 1213109993 in words is "one billion, two hundred thirteen million, one hundred nine thousand, nine hundred ninety-three".