71394221 has 2 divisors, whose sum is σ = 71394222. Its totient is φ = 71394220.

The previous prime is 71394187. The next prime is 71394227. The reversal of 71394221 is 12249317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 6832996 = 8035^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 71394221 - 2⁶ = 71394157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71394227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35697110 + 35697111.

It is an arithmetic number, because the mean of its divisors is an integer number (35697111).

Almost surely, 2^71394221 is an apocalyptic number.

It is an amenable number.

71394221 is a deficient number, since it is larger than the sum of its proper divisors (1).

71394221 is an equidigital number, since it uses as much as digits as its factorization.

71394221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 71394221 is about 8449.5101041421. The cubic root of 71394221 is about 414.8467445919.

The spelling of 71394221 in words is "seventy-one million, three hundred ninety-four thousand, two hundred twenty-one".