71001231 has 24 divisors (see below), whose sum is σ = 114940800. Its totient is φ = 38182272.

The previous prime is 71001223. The next prime is 71001239. The reversal of 71001231 is 13210017.

It is an interprime number because it is at equal distance from previous prime (71001223) and next prime (71001239).

It is not a de Polignac number, because 71001231 - 2³ = 71001223 is a prime.

It is a super-2 number, since 2×71001231² = 10082349607030722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71001231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71001239) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220 + ... + 11918.

It is an arithmetic number, because the mean of its divisors is an integer number (4789200).

Almost surely, 2^71001231 is an apocalyptic number.

71001231 is a deficient number, since it is larger than the sum of its proper divisors (43939569).

71001231 is a wasteful number, since it uses less digits than its factorization.

71001231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11743 (or 11726 counting only the distinct ones).

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 71001231 is about 8426.2228192708. Note that the first 3 decimals coincide. The cubic root of 71001231 is about 414.0841680489.

Adding to 71001231 its reverse (13210017), we get a palindrome (84211248).

The spelling of 71001231 in words is "seventy-one million, one thousand, two hundred thirty-one".