71671121 has 2 divisors, whose sum is σ = 71671122. Its totient is φ = 71671120.

The previous prime is 71671087. The next prime is 71671123. The reversal of 71671121 is 12117617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47059600 + 24611521 = 6860^2 + 4961^2 .

It is a cyclic number.

It is not a de Polignac number, because 71671121 - 2⁶ = 71671057 is a prime.

Together with 71671123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71671123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35835560 + 35835561.

It is an arithmetic number, because the mean of its divisors is an integer number (35835561).

Almost surely, 2^71671121 is an apocalyptic number.

It is an amenable number.

71671121 is a deficient number, since it is larger than the sum of its proper divisors (1).

71671121 is an equidigital number, since it uses as much as digits as its factorization.

71671121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 588, while the sum is 26.

The square root of 71671121 is about 8465.8798125180. The cubic root of 71671121 is about 415.3823755964.

Adding to 71671121 its reverse (12117617), we get a palindrome (83788738).

The spelling of 71671121 in words is "seventy-one million, six hundred seventy-one thousand, one hundred twenty-one".