4091993 has 2 divisors, whose sum is σ = 4091994. Its totient is φ = 4091992.

The previous prime is 4091959. The next prime is 4092007. The reversal of 4091993 is 3991904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3829849 + 262144 = 1957^2 + 512^2 .

It is a cyclic number.

It is not a de Polignac number, because 4091993 - 2¹⁰ = 4090969 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4091933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045996 + 2045997.

It is an arithmetic number, because the mean of its divisors is an integer number (2045997).

Almost surely, 2^4091993 is an apocalyptic number.

It is an amenable number.

4091993 is a deficient number, since it is larger than the sum of its proper divisors (1).

4091993 is an equidigital number, since it uses as much as digits as its factorization.

4091993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 4091993 is about 2022.8675191421. The cubic root of 4091993 is about 159.9478084980.

The spelling of 4091993 in words is "four million, ninety-one thousand, nine hundred ninety-three".