71058409 has 2 divisors, whose sum is σ = 71058410. Its totient is φ = 71058408.

The previous prime is 71058397. The next prime is 71058413. The reversal of 71058409 is 90485017.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71031184 + 27225 = 8428^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 71058409 - 2²¹ = 68961257 is a prime.

It is a super-2 number, since 2×71058409² = 10098594979222562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71058509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35529204 + 35529205.

It is an arithmetic number, because the mean of its divisors is an integer number (35529205).

Almost surely, 2^71058409 is an apocalyptic number.

It is an amenable number.

71058409 is a deficient number, since it is larger than the sum of its proper divisors (1).

71058409 is an equidigital number, since it uses as much as digits as its factorization.

71058409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 71058409 is about 8429.6149971395. The cubic root of 71058409 is about 414.1952935953.

The spelling of 71058409 in words is "seventy-one million, fifty-eight thousand, four hundred nine".