94091521 has 2 divisors, whose sum is σ = 94091522. Its totient is φ = 94091520.

The previous prime is 94091507. The next prime is 94091527. The reversal of 94091521 is 12519049.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94090000 + 1521 = 9700^2 + 39^2 .

It is an emirp because it is prime and its reverse (12519049) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 94091521 - 2¹³ = 94083329 is a prime.

It is not a weakly prime, because it can be changed into another prime (94091527) 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, 47045760 + 47045761.

It is an arithmetic number, because the mean of its divisors is an integer number (47045761).

Almost surely, 2^94091521 is an apocalyptic number.

It is an amenable number.

94091521 is a deficient number, since it is larger than the sum of its proper divisors (1).

94091521 is an equidigital number, since it uses as much as digits as its factorization.

94091521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 94091521 is about 9700.0784017450. The cubic root of 94091521 is about 454.8311106873.

It can be divided in two parts, 9409 and 1521, that multiplied together give a square (14311089 = 3783²).

The spelling of 94091521 in words is "ninety-four million, ninety-one thousand, five hundred twenty-one".