71142487 has 4 divisors (see below), whose sum is σ = 76615000. Its totient is φ = 65669976.

The previous prime is 71142437. The next prime is 71142493. The reversal of 71142487 is 78424117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78424117 = 2719 ⋅28843.

It is a cyclic number.

It is not a de Polignac number, because 71142487 - 2¹⁹ = 70618199 is a prime.

It is a super-2 number, since 2×71142487² = 10122506913090338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71142437) 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, 2736237 + ... + 2736262.

It is an arithmetic number, because the mean of its divisors is an integer number (19153750).

Almost surely, 2^71142487 is an apocalyptic number.

71142487 is a deficient number, since it is larger than the sum of its proper divisors (5472513).

71142487 is a wasteful number, since it uses less digits than its factorization.

71142487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5472512.

The product of its digits is 12544, while the sum is 34.

The square root of 71142487 is about 8434.6005833116. The cubic root of 71142487 is about 414.3585911147.

The spelling of 71142487 in words is "seventy-one million, one hundred forty-two thousand, four hundred eighty-seven".