71477281 has 2 divisors, whose sum is σ = 71477282. Its totient is φ = 71477280.

The previous prime is 71477239. The next prime is 71477321. The reversal of 71477281 is 18277417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69472225 + 2005056 = 8335^2 + 1416^2 .

It is a cyclic number.

It is not a de Polignac number, because 71477281 - 2¹¹ = 71475233 is a prime.

It is a super-2 number, since 2×71477281² = 10218003398305922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71477281.

It is not a weakly prime, because it can be changed into another prime (71477201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35738640 + 35738641.

It is an arithmetic number, because the mean of its divisors is an integer number (35738641).

Almost surely, 2^71477281 is an apocalyptic number.

It is an amenable number.

71477281 is a deficient number, since it is larger than the sum of its proper divisors (1).

71477281 is an equidigital number, since it uses as much as digits as its factorization.

71477281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21952, while the sum is 37.

The square root of 71477281 is about 8454.4237532785. The cubic root of 71477281 is about 415.0075597404.

The spelling of 71477281 in words is "seventy-one million, four hundred seventy-seven thousand, two hundred eighty-one".