71244031 has 4 divisors (see below), whose sum is σ = 72588312. Its totient is φ = 69899752.

The previous prime is 71244029. The next prime is 71244067. The reversal of 71244031 is 13044217.

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 71244031 - 2¹ = 71244029 is a prime.

It is a super-2 number, since 2×71244031² = 10151423906257922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71243993 and 71244011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71244001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672061 + ... + 672166.

It is an arithmetic number, because the mean of its divisors is an integer number (18147078).

Almost surely, 2^71244031 is an apocalyptic number.

71244031 is a deficient number, since it is larger than the sum of its proper divisors (1344281).

71244031 is a wasteful number, since it uses less digits than its factorization.

71244031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344280.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 71244031 is about 8440.6179276164. The cubic root of 71244031 is about 414.5556399190. Note that the first 3 decimals are identical.

Adding to 71244031 its reverse (13044217), we get a palindrome (84288248).

The spelling of 71244031 in words is "seventy-one million, two hundred forty-four thousand, thirty-one".