94542181 has 2 divisors, whose sum is σ = 94542182. Its totient is φ = 94542180.

The previous prime is 94542179. The next prime is 94542197. The reversal of 94542181 is 18124549.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91872225 + 2669956 = 9585^2 + 1634^2 .

It is an emirp because it is prime and its reverse (18124549) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 94542181 - 2¹ = 94542179 is a prime.

It is a super-2 number, since 2×94542181² = 17876447976473522, which contains 22 as substring.

Together with 94542179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (94542781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47271090 + 47271091.

It is an arithmetic number, because the mean of its divisors is an integer number (47271091).

Almost surely, 2^94542181 is an apocalyptic number.

It is an amenable number.

94542181 is a deficient number, since it is larger than the sum of its proper divisors (1).

94542181 is an equidigital number, since it uses as much as digits as its factorization.

94542181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 94542181 is about 9723.2803621000. The cubic root of 94542181 is about 455.5561062610.

The spelling of 94542181 in words is "ninety-four million, five hundred forty-two thousand, one hundred eighty-one".