94197721 has 2 divisors, whose sum is σ = 94197722. Its totient is φ = 94197720.

The previous prime is 94197683. The next prime is 94197737. The reversal of 94197721 is 12779149.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80802121 + 13395600 = 8989^2 + 3660^2 .

It is an emirp because it is prime and its reverse (12779149) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 94197721 - 2¹⁷ = 94066649 is a prime.

It is not a weakly prime, because it can be changed into another prime (94195721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47098860 + 47098861.

It is an arithmetic number, because the mean of its divisors is an integer number (47098861).

Almost surely, 2^94197721 is an apocalyptic number.

It is an amenable number.

94197721 is a deficient number, since it is larger than the sum of its proper divisors (1).

94197721 is an equidigital number, since it uses as much as digits as its factorization.

94197721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 94197721 is about 9705.5510405128. The cubic root of 94197721 is about 455.0021671998.

The spelling of 94197721 in words is "ninety-four million, one hundred ninety-seven thousand, seven hundred twenty-one".