71205143 has 2 divisors, whose sum is σ = 71205144. Its totient is φ = 71205142.

The previous prime is 71205139. The next prime is 71205157. The reversal of 71205143 is 34150217.

It is a weak prime.

It is an emirp because it is prime and its reverse (34150217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71205143 - 2² = 71205139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71205193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35602571 + 35602572.

It is an arithmetic number, because the mean of its divisors is an integer number (35602572).

Almost surely, 2^71205143 is an apocalyptic number.

71205143 is a deficient number, since it is larger than the sum of its proper divisors (1).

71205143 is an equidigital number, since it uses as much as digits as its factorization.

71205143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 71205143 is about 8438.3139903656. The cubic root of 71205143 is about 414.4801988675.

The spelling of 71205143 in words is "seventy-one million, two hundred five thousand, one hundred forty-three".