71315281 has 2 divisors, whose sum is σ = 71315282. Its totient is φ = 71315280.

The previous prime is 71315219. The next prime is 71315287. The reversal of 71315281 is 18251317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40844881 + 30470400 = 6391^2 + 5520^2 .

It is a cyclic number.

It is not a de Polignac number, because 71315281 - 2¹⁷ = 71184209 is a prime.

It is a super-2 number, since 2×71315281² = 10171738608217922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71315287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35657640 + 35657641.

It is an arithmetic number, because the mean of its divisors is an integer number (35657641).

Almost surely, 2^71315281 is an apocalyptic number.

It is an amenable number.

71315281 is a deficient number, since it is larger than the sum of its proper divisors (1).

71315281 is an equidigital number, since it uses as much as digits as its factorization.

71315281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 71315281 is about 8444.8375354414. The cubic root of 71315281 is about 414.6937906660.

Adding to 71315281 its reverse (18251317), we get a palindrome (89566598).

The spelling of 71315281 in words is "seventy-one million, three hundred fifteen thousand, two hundred eighty-one".