234991817 has 2 divisors, whose sum is σ = 234991818. Its totient is φ = 234991816.

The previous prime is 234991793. The next prime is 234991819. The reversal of 234991817 is 718199432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137851081 + 97140736 = 11741^2 + 9856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-234991817 is a prime.

It is a super-2 number, since 2×234991817² = 110442308113922978, which contains 22 as substring.

Together with 234991819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (234991819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117495908 + 117495909.

It is an arithmetic number, because the mean of its divisors is an integer number (117495909).

Almost surely, 2^234991817 is an apocalyptic number.

It is an amenable number.

234991817 is a deficient number, since it is larger than the sum of its proper divisors (1).

234991817 is an equidigital number, since it uses as much as digits as its factorization.

234991817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 234991817 is about 15329.4428144013. The cubic root of 234991817 is about 617.0934164512.

The spelling of 234991817 in words is "two hundred thirty-four million, nine hundred ninety-one thousand, eight hundred seventeen".