71233609 has 2 divisors, whose sum is σ = 71233610. Its totient is φ = 71233608.

The previous prime is 71233607. The next prime is 71233633. The reversal of 71233609 is 90633217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 9 = 8440^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 71233609 - 2¹ = 71233607 is a prime.

Together with 71233607, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71233607) 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, 35616804 + 35616805.

It is an arithmetic number, because the mean of its divisors is an integer number (35616805).

Almost surely, 2^71233609 is an apocalyptic number.

It is an amenable number.

71233609 is a deficient number, since it is larger than the sum of its proper divisors (1).

71233609 is an equidigital number, since it uses as much as digits as its factorization.

71233609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 71233609 is about 8440.0005331753. Note that the first 3 decimals coincide. The cubic root of 71233609 is about 414.5354243795.

The spelling of 71233609 in words is "seventy-one million, two hundred thirty-three thousand, six hundred nine".