71243173 has 2 divisors, whose sum is σ = 71243174. Its totient is φ = 71243172.

The previous prime is 71243119. The next prime is 71243189. The reversal of 71243173 is 37134217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68260644 + 2982529 = 8262^2 + 1727^2 .

It is an emirp because it is prime and its reverse (37134217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71243173 - 2¹⁷ = 71112101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71243113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35621586 + 35621587.

It is an arithmetic number, because the mean of its divisors is an integer number (35621587).

Almost surely, 2^71243173 is an apocalyptic number.

It is an amenable number.

71243173 is a deficient number, since it is larger than the sum of its proper divisors (1).

71243173 is an equidigital number, since it uses as much as digits as its factorization.

71243173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 28.

The square root of 71243173 is about 8440.5671018007. The cubic root of 71243173 is about 414.5539757321.

The spelling of 71243173 in words is "seventy-one million, two hundred forty-three thousand, one hundred seventy-three".