71996143 has 2 divisors, whose sum is σ = 71996144. Its totient is φ = 71996142.

The previous prime is 71996131. The next prime is 71996161. The reversal of 71996143 is 34169917.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71996143 - 2²¹ = 69898991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71996096 and 71996105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71996543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35998071 + 35998072.

It is an arithmetic number, because the mean of its divisors is an integer number (35998072).

Almost surely, 2^71996143 is an apocalyptic number.

71996143 is a deficient number, since it is larger than the sum of its proper divisors (1).

71996143 is an equidigital number, since it uses as much as digits as its factorization.

71996143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 71996143 is about 8485.0540952901. The cubic root of 71996143 is about 416.0093358821.

The spelling of 71996143 in words is "seventy-one million, nine hundred ninety-six thousand, one hundred forty-three".