71017081 has 2 divisors, whose sum is σ = 71017082. Its totient is φ = 71017080.

The previous prime is 71017057. The next prime is 71017091. The reversal of 71017081 is 18071017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41216400 + 29800681 = 6420^2 + 5459^2 .

It is a cyclic number.

It is not a de Polignac number, because 71017081 - 2¹⁵ = 70984313 is a prime.

It is a super-2 number, since 2×71017081² = 10086851587521122, which contains 22 as substring.

It is equal to p_4174333 and since 71017081 and 4174333 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (71017091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35508540 + 35508541.

It is an arithmetic number, because the mean of its divisors is an integer number (35508541).

Almost surely, 2^71017081 is an apocalyptic number.

It is an amenable number.

71017081 is a deficient number, since it is larger than the sum of its proper divisors (1).

71017081 is an equidigital number, since it uses as much as digits as its factorization.

71017081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 25.

The square root of 71017081 is about 8427.1632830983. The cubic root of 71017081 is about 414.1149785276.

Adding to 71017081 its reverse (18071017), we get a palindrome (89088098).

The spelling of 71017081 in words is "seventy-one million, seventeen thousand, eighty-one".