211109993 has 2 divisors, whose sum is σ = 211109994. Its totient is φ = 211109992.

The previous prime is 211109989. The next prime is 211110017. The reversal of 211109993 is 399901112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136235584 + 74874409 = 11672^2 + 8653^2 .

It is a cyclic number.

It is not a de Polignac number, because 211109993 - 2² = 211109989 is a prime.

It is not a weakly prime, because it can be changed into another prime (211109953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105554996 + 105554997.

It is an arithmetic number, because the mean of its divisors is an integer number (105554997).

Almost surely, 2^211109993 is an apocalyptic number.

It is an amenable number.

211109993 is a deficient number, since it is larger than the sum of its proper divisors (1).

211109993 is an equidigital number, since it uses as much as digits as its factorization.

211109993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 211109993 is about 14529.6246682425. The cubic root of 211109993 is about 595.4376113571.

The spelling of 211109993 in words is "two hundred eleven million, one hundred nine thousand, nine hundred ninety-three".