71144031 has 48 divisors (see below), whose sum is σ = 118589184. Its totient is φ = 37801344.

The previous prime is 71144027. The next prime is 71144033. The reversal of 71144031 is 13044117.

It is not a de Polignac number, because 71144031 - 2² = 71144027 is a prime.

It is a super-2 number, since 2×71144031² = 10122946293857922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 71143989 and 71144007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71144033) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 857116 + ... + 857198.

It is an arithmetic number, because the mean of its divisors is an integer number (2470608).

Almost surely, 2^71144031 is an apocalyptic number.

71144031 is a deficient number, since it is larger than the sum of its proper divisors (47445153).

71144031 is an frugal number, since it uses more digits than its factorization.

71144031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 71144031 is about 8434.6921105634. The cubic root of 71144031 is about 414.3615886907.

Adding to 71144031 its reverse (13044117), we get a palindrome (84188148).

The spelling of 71144031 in words is "seventy-one million, one hundred forty-four thousand, thirty-one".