4117991 has 2 divisors, whose sum is σ = 4117992. Its totient is φ = 4117990.

The previous prime is 4117987. The next prime is 4118057. The reversal of 4117991 is 1997114.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4117991 - 2² = 4117987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4117291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2058995 + 2058996.

It is an arithmetic number, because the mean of its divisors is an integer number (2058996).

Almost surely, 2^4117991 is an apocalyptic number.

4117991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4117991 is an equidigital number, since it uses as much as digits as its factorization.

4117991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 32.

The square root of 4117991 is about 2029.2833710451. The cubic root of 4117991 is about 160.2858302235.

The spelling of 4117991 in words is "four million, one hundred seventeen thousand, nine hundred ninety-one".