71424431 has 4 divisors (see below), whose sum is σ = 76918632. Its totient is φ = 65930232.

The previous prime is 71424391. The next prime is 71424449. The reversal of 71424431 is 13442417.

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 71424431 - 2¹⁴ = 71408047 is a prime.

It is a super-2 number, since 2×71424431² = 10202898687347522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71424431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71427431) 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, 2747081 + ... + 2747106.

It is an arithmetic number, because the mean of its divisors is an integer number (19229658).

Almost surely, 2^71424431 is an apocalyptic number.

71424431 is a deficient number, since it is larger than the sum of its proper divisors (5494201).

71424431 is a wasteful number, since it uses less digits than its factorization.

71424431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494200.

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

The square root of 71424431 is about 8451.2975926777. The cubic root of 71424431 is about 414.9052495741.

Adding to 71424431 its reverse (13442417), we get a palindrome (84866848).

The spelling of 71424431 in words is "seventy-one million, four hundred twenty-four thousand, four hundred thirty-one".