71656441 has 2 divisors, whose sum is σ = 71656442. Its totient is φ = 71656440.

The previous prime is 71656439. The next prime is 71656451. The reversal of 71656441 is 14465617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71048041 + 608400 = 8429^2 + 780^2 .

It is an emirp because it is prime and its reverse (14465617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71656441 - 2¹ = 71656439 is a prime.

Together with 71656439, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 71656397 and 71656406.

It is not a weakly prime, because it can be changed into another prime (71656421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35828220 + 35828221.

It is an arithmetic number, because the mean of its divisors is an integer number (35828221).

Almost surely, 2^71656441 is an apocalyptic number.

It is an amenable number.

71656441 is a deficient number, since it is larger than the sum of its proper divisors (1).

71656441 is an equidigital number, since it uses as much as digits as its factorization.

71656441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 71656441 is about 8465.0127584074. The cubic root of 71656441 is about 415.3540135004.

The spelling of 71656441 in words is "seventy-one million, six hundred fifty-six thousand, four hundred forty-one".