94721281 has 2 divisors, whose sum is σ = 94721282. Its totient is φ = 94721280.

The previous prime is 94721273. The next prime is 94721287. The reversal of 94721281 is 18212749.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70711281 + 24010000 = 8409^2 + 4900^2 .

It is an emirp because it is prime and its reverse (18212749) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 94721281 - 2³ = 94721273 is a prime.

It is a super-2 number, since 2×94721281² = 17944242148561922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (94721287) 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, 47360640 + 47360641.

It is an arithmetic number, because the mean of its divisors is an integer number (47360641).

Almost surely, 2^94721281 is an apocalyptic number.

94721281 is the 4353-rd centered decagonal number.

It is an amenable number.

94721281 is a deficient number, since it is larger than the sum of its proper divisors (1).

94721281 is an equidigital number, since it uses as much as digits as its factorization.

94721281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 94721281 is about 9732.4858592243. The cubic root of 94721281 is about 455.8435921596.

The spelling of 94721281 in words is "ninety-four million, seven hundred twenty-one thousand, two hundred eighty-one".