84311917 has 2 divisors, whose sum is σ = 84311918. Its totient is φ = 84311916.

The previous prime is 84311897. The next prime is 84311921. The reversal of 84311917 is 71911348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66113161 + 18198756 = 8131^2 + 4266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84311917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84311947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42155958 + 42155959.

It is an arithmetic number, because the mean of its divisors is an integer number (42155959).

Almost surely, 2^84311917 is an apocalyptic number.

It is an amenable number.

84311917 is a deficient number, since it is larger than the sum of its proper divisors (1).

84311917 is an equidigital number, since it uses as much as digits as its factorization.

84311917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 84311917 is about 9182.1520897881. The cubic root of 84311917 is about 438.4933263322.

The spelling of 84311917 in words is "eighty-four million, three hundred eleven thousand, nine hundred seventeen".