47313281 has 2 divisors, whose sum is σ = 47313282. Its totient is φ = 47313280.

The previous prime is 47313229. The next prime is 47313307. The reversal of 47313281 is 18231374.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38551681 + 8761600 = 6209^2 + 2960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47313281 is a prime.

It is a super-2 number, since 2×47313281² = 4477093117969922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (47313481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23656640 + 23656641.

It is an arithmetic number, because the mean of its divisors is an integer number (23656641).

Almost surely, 2^47313281 is an apocalyptic number.

It is an amenable number.

47313281 is a deficient number, since it is larger than the sum of its proper divisors (1).

47313281 is an equidigital number, since it uses as much as digits as its factorization.

47313281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 47313281 is about 6878.4650177202. The cubic root of 47313281 is about 361.6826604474.

The spelling of 47313281 in words is "forty-seven million, three hundred thirteen thousand, two hundred eighty-one".