47319281 has 2 divisors, whose sum is σ = 47319282. Its totient is φ = 47319280.

The previous prime is 47319277. The next prime is 47319317. The reversal of 47319281 is 18291374.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32947600 + 14371681 = 5740^2 + 3791^2 .

It is a cyclic number.

It is not a de Polignac number, because 47319281 - 2² = 47319277 is a prime.

It is a super-2 number, since 2×47319281² = 4478228708713922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (47319241) 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, 23659640 + 23659641.

It is an arithmetic number, because the mean of its divisors is an integer number (23659641).

Almost surely, 2^47319281 is an apocalyptic number.

It is an amenable number.

47319281 is a deficient number, since it is larger than the sum of its proper divisors (1).

47319281 is an equidigital number, since it uses as much as digits as its factorization.

47319281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 47319281 is about 6878.9011477125. The cubic root of 47319281 is about 361.6979486440.

The spelling of 47319281 in words is "forty-seven million, three hundred nineteen thousand, two hundred eighty-one".