71443731 has 4 divisors (see below), whose sum is σ = 95258312. Its totient is φ = 47629152.

The previous prime is 71443717. The next prime is 71443739. The reversal of 71443731 is 13734417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13734417 = 3 ⋅4578139.

It is not a de Polignac number, because 71443731 - 2⁵ = 71443699 is a prime.

It is a super-2 number, since 2×71443731² = 10208413398400722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71443739) 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, 11907286 + ... + 11907291.

It is an arithmetic number, because the mean of its divisors is an integer number (23814578).

Almost surely, 2^71443731 is an apocalyptic number.

71443731 is a deficient number, since it is larger than the sum of its proper divisors (23814581).

71443731 is a wasteful number, since it uses less digits than its factorization.

71443731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23814580.

The product of its digits is 7056, while the sum is 30.

The square root of 71443731 is about 8452.4393520451. The cubic root of 71443731 is about 414.9426175076.

The spelling of 71443731 in words is "seventy-one million, four hundred forty-three thousand, seven hundred thirty-one".