94186721 has 2 divisors, whose sum is σ = 94186722. Its totient is φ = 94186720.

The previous prime is 94186691. The next prime is 94186733. The reversal of 94186721 is 12768149.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94090000 + 96721 = 9700^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 94186721 - 2²⁶ = 27077857 is a prime.

It is a super-2 number, since 2×94186721² = 17742276825463682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (94186921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47093360 + 47093361.

It is an arithmetic number, because the mean of its divisors is an integer number (47093361).

Almost surely, 2^94186721 is an apocalyptic number.

It is an amenable number.

94186721 is a deficient number, since it is larger than the sum of its proper divisors (1).

94186721 is an equidigital number, since it uses as much as digits as its factorization.

94186721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 94186721 is about 9704.9843379575. The cubic root of 94186721 is about 454.9844554525.

The spelling of 94186721 in words is "ninety-four million, one hundred eighty-six thousand, seven hundred twenty-one".