71656801 has 2 divisors, whose sum is σ = 71656802. Its totient is φ = 71656800.

The previous prime is 71656789. The next prime is 71656817. The reversal of 71656801 is 10865617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71656225 + 576 = 8465^2 + 24^2 .

It is a cyclic number.

It is not a de Polignac number, because 71656801 - 2⁵ = 71656769 is a prime.

It is not a weakly prime, because it can be changed into another prime (71656831) 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, 35828400 + 35828401.

It is an arithmetic number, because the mean of its divisors is an integer number (35828401).

Almost surely, 2^71656801 is an apocalyptic number.

It is an amenable number.

71656801 is a deficient number, since it is larger than the sum of its proper divisors (1).

71656801 is an equidigital number, since it uses as much as digits as its factorization.

71656801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 71656801 is about 8465.0340223770. The cubic root of 71656801 is about 415.3547090750.

The spelling of 71656801 in words is "seventy-one million, six hundred fifty-six thousand, eight hundred one".