71442143 has 4 divisors (see below), whose sum is σ = 75644640. Its totient is φ = 67239648.

The previous prime is 71442113. The next prime is 71442157. The reversal of 71442143 is 34124417.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71442143 - 2¹² = 71438047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71442113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101223 + ... + 2101256.

It is an arithmetic number, because the mean of its divisors is an integer number (18911160).

Almost surely, 2^71442143 is an apocalyptic number.

71442143 is a deficient number, since it is larger than the sum of its proper divisors (4202497).

71442143 is a wasteful number, since it uses less digits than its factorization.

71442143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202496.

The product of its digits is 2688, while the sum is 26.

The square root of 71442143 is about 8452.3454141439. The cubic root of 71442143 is about 414.9395431358.

The spelling of 71442143 in words is "seventy-one million, four hundred forty-two thousand, one hundred forty-three".