71164021 has 2 divisors, whose sum is σ = 71164022. Its totient is φ = 71164020.

The previous prime is 71164019. The next prime is 71164031. The reversal of 71164021 is 12046117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47748100 + 23415921 = 6910^2 + 4839^2 .

It is an emirp because it is prime and its reverse (12046117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71164021 - 2¹ = 71164019 is a prime.

Together with 71164019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 71163983 and 71164001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71164031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35582010 + 35582011.

It is an arithmetic number, because the mean of its divisors is an integer number (35582011).

Almost surely, 2^71164021 is an apocalyptic number.

It is an amenable number.

71164021 is a deficient number, since it is larger than the sum of its proper divisors (1).

71164021 is an equidigital number, since it uses as much as digits as its factorization.

71164021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 71164021 is about 8435.8770142766. The cubic root of 71164021 is about 414.4003940661.

The spelling of 71164021 in words is "seventy-one million, one hundred sixty-four thousand, twenty-one".