94195721 has 2 divisors, whose sum is σ = 94195722. Its totient is φ = 94195720.

The previous prime is 94195709. The next prime is 94195723. The reversal of 94195721 is 12759149.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52722121 + 41473600 = 7261^2 + 6440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-94195721 is a prime.

Together with 94195723, 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 (94195723) 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, 47097860 + 47097861.

It is an arithmetic number, because the mean of its divisors is an integer number (47097861).

Almost surely, 2^94195721 is an apocalyptic number.

It is an amenable number.

94195721 is a deficient number, since it is larger than the sum of its proper divisors (1).

94195721 is an equidigital number, since it uses as much as digits as its factorization.

94195721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 94195721 is about 9705.4480061458. The cubic root of 94195721 is about 454.9989469846.

The spelling of 94195721 in words is "ninety-four million, one hundred ninety-five thousand, seven hundred twenty-one".