71642843 has 2 divisors, whose sum is σ = 71642844. Its totient is φ = 71642842.

The previous prime is 71642827. The next prime is 71642887. The reversal of 71642843 is 34824617.

It is a weak prime.

It is an emirp because it is prime and its reverse (34824617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71642843 - 2⁴ = 71642827 is a prime.

It is not a weakly prime, because it can be changed into another prime (71642143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35821421 + 35821422.

It is an arithmetic number, because the mean of its divisors is an integer number (35821422).

Almost surely, 2^71642843 is an apocalyptic number.

71642843 is a deficient number, since it is larger than the sum of its proper divisors (1).

71642843 is an equidigital number, since it uses as much as digits as its factorization.

71642843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 35.

The square root of 71642843 is about 8464.2095319055. The cubic root of 71642843 is about 415.3277383970.

The spelling of 71642843 in words is "seventy-one million, six hundred forty-two thousand, eight hundred forty-three".