71531001 has 12 divisors (see below), whose sum is σ = 104389012. Its totient is φ = 47195136.

The previous prime is 71530999. The next prime is 71531017. The reversal of 71531001 is 10013517.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 45765225 + 25765776 = 6765^2 + 5076^2 .

It is not a de Polignac number, because 71531001 - 2¹ = 71530999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71531051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40096 + ... + 41841.

Almost surely, 2^71531001 is an apocalyptic number.

It is an amenable number.

71531001 is a deficient number, since it is larger than the sum of its proper divisors (32858011).

71531001 is a wasteful number, since it uses less digits than its factorization.

71531001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82040 (or 82037 counting only the distinct ones).

The product of its (nonzero) digits is 105, while the sum is 18.

The square root of 71531001 is about 8457.6001915437. The cubic root of 71531001 is about 415.1115024334. Note that the first 3 decimals are identical.

Adding to 71531001 its reverse (10013517), we get a palindrome (81544518).

The spelling of 71531001 in words is "seventy-one million, five hundred thirty-one thousand, one".