71553329 has 2 divisors, whose sum is σ = 71553330. Its totient is φ = 71553328.

The previous prime is 71553283. The next prime is 71553331. The reversal of 71553329 is 92335517.

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., 46553329 + 25000000 = 6823^2 + 5000^2 .

It is a cyclic number.

It is not a de Polignac number, because 71553329 - 2⁸ = 71553073 is a prime.

Together with 71553331, 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 (71553389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35776664 + 35776665.

It is an arithmetic number, because the mean of its divisors is an integer number (35776665).

Almost surely, 2^71553329 is an apocalyptic number.

It is an amenable number.

71553329 is a deficient number, since it is larger than the sum of its proper divisors (1).

71553329 is an equidigital number, since it uses as much as digits as its factorization.

71553329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 35.

The square root of 71553329 is about 8458.9200847389. The cubic root of 71553329 is about 415.1546895145.

The spelling of 71553329 in words is "seventy-one million, five hundred fifty-three thousand, three hundred twenty-nine".