71875409 has 2 divisors, whose sum is σ = 71875410. Its totient is φ = 71875408.

The previous prime is 71875379. The next prime is 71875451. The reversal of 71875409 is 90457817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67240000 + 4635409 = 8200^2 + 2153^2 .

It is an emirp because it is prime and its reverse (90457817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71875409 - 2²⁴ = 55098193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71875459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35937704 + 35937705.

It is an arithmetic number, because the mean of its divisors is an integer number (35937705).

Almost surely, 2^71875409 is an apocalyptic number.

It is an amenable number.

71875409 is a deficient number, since it is larger than the sum of its proper divisors (1).

71875409 is an equidigital number, since it uses as much as digits as its factorization.

71875409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 71875409 is about 8477.9366003763. The cubic root of 71875409 is about 415.7766633572.

The spelling of 71875409 in words is "seventy-one million, eight hundred seventy-five thousand, four hundred nine".