71145071 has 4 divisors (see below), whose sum is σ = 71161944. Its totient is φ = 71128200.

The previous prime is 71145047. The next prime is 71145077. The reversal of 71145071 is 17054117.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17054117 = 29 ⋅588073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71145071 is a prime.

It is a super-2 number, since 2×71145071² = 10123242255190082, 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 71145071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71145077) 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, 4001 + ... + 12581.

It is an arithmetic number, because the mean of its divisors is an integer number (17790486).

Almost surely, 2^71145071 is an apocalyptic number.

71145071 is a deficient number, since it is larger than the sum of its proper divisors (16873).

71145071 is an equidigital number, since it uses as much as digits as its factorization.

71145071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16872.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 71145071 is about 8434.7537604841. The cubic root of 71145071 is about 414.3636077590.

Adding to 71145071 its reverse (17054117), we get a palindrome (88199188).

The spelling of 71145071 in words is "seventy-one million, one hundred forty-five thousand, seventy-one".