71721707 has 2 divisors, whose sum is σ = 71721708. Its totient is φ = 71721706.

The previous prime is 71721701. The next prime is 71721719. The reversal of 71721707 is 70712717.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71721707 - 2¹⁶ = 71656171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71721701) 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, 35860853 + 35860854.

It is an arithmetic number, because the mean of its divisors is an integer number (35860854).

Almost surely, 2^71721707 is an apocalyptic number.

71721707 is a deficient number, since it is larger than the sum of its proper divisors (1).

71721707 is an equidigital number, since it uses as much as digits as its factorization.

71721707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4802, while the sum is 32.

The square root of 71721707 is about 8468.8669253921. The cubic root of 71721707 is about 415.4800792503.

The spelling of 71721707 in words is "seventy-one million, seven hundred twenty-one thousand, seven hundred seven".