71264909 has 2 divisors, whose sum is σ = 71264910. Its totient is φ = 71264908.

The previous prime is 71264899. The next prime is 71264911. The reversal of 71264909 is 90946217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 11202409 = 7750^2 + 3347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71264909 is a prime.

Together with 71264911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71264959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35632454 + 35632455.

It is an arithmetic number, because the mean of its divisors is an integer number (35632455).

Almost surely, 2^71264909 is an apocalyptic number.

It is an amenable number.

71264909 is a deficient number, since it is larger than the sum of its proper divisors (1).

71264909 is an equidigital number, since it uses as much as digits as its factorization.

71264909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 71264909 is about 8441.8545948151. The cubic root of 71264909 is about 414.5961310180.

The spelling of 71264909 in words is "seventy-one million, two hundred sixty-four thousand, nine hundred nine".