57281947 has 2 divisors, whose sum is σ = 57281948. Its totient is φ = 57281946.

The previous prime is 57281899. The next prime is 57281981. The reversal of 57281947 is 74918275.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57281947 is a prime.

It is a super-2 number, since 2×57281947² = 6562442904221618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (57581947) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28640973 + 28640974.

It is an arithmetic number, because the mean of its divisors is an integer number (28640974).

Almost surely, 2^57281947 is an apocalyptic number.

57281947 is a deficient number, since it is larger than the sum of its proper divisors (1).

57281947 is an equidigital number, since it uses as much as digits as its factorization.

57281947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 57281947 is about 7568.4837979611. The cubic root of 57281947 is about 385.4836155638.

The spelling of 57281947 in words is "fifty-seven million, two hundred eighty-one thousand, nine hundred forty-seven".