71041409 has 2 divisors, whose sum is σ = 71041410. Its totient is φ = 71041408.

The previous prime is 71041403. The next prime is 71041447. The reversal of 71041409 is 90414017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51265600 + 19775809 = 7160^2 + 4447^2 .

It is a cyclic number.

It is not a de Polignac number, because 71041409 - 2⁸ = 71041153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71041403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35520704 + 35520705.

It is an arithmetic number, because the mean of its divisors is an integer number (35520705).

Almost surely, 2^71041409 is an apocalyptic number.

It is an amenable number.

71041409 is a deficient number, since it is larger than the sum of its proper divisors (1).

71041409 is an equidigital number, since it uses as much as digits as its factorization.

71041409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 71041409 is about 8428.6065870937. The cubic root of 71041409 is about 414.1622602936.

The spelling of 71041409 in words is "seventy-one million, forty-one thousand, four hundred nine".