71521510041 has 6 divisors (see below), whose sum is σ = 103308847850. Its totient is φ = 47681006688.

The previous prime is 71521510013. The next prime is 71521510069. The reversal of 71521510041 is 14001512517.

It is an interprime number because it is at equal distance from previous prime (71521510013) and next prime (71521510069).

It can be written as a sum of positive squares in only one way, i.e., 71518270041 + 3240000 = 267429^2 + 1800^2 .

It is not a de Polignac number, because 71521510041 - 2⁶ = 71521509977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71521509987 and 71521510014.

It is not an unprimeable number, because it can be changed into a prime (71521510001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3973417216 + ... + 3973417233.

Almost surely, 2^71521510041 is an apocalyptic number.

It is an amenable number.

71521510041 is a deficient number, since it is larger than the sum of its proper divisors (31787337809).

71521510041 is a wasteful number, since it uses less digits than its factorization.

71521510041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7946834455 (or 7946834452 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The spelling of 71521510041 in words is "seventy-one billion, five hundred twenty-one million, five hundred ten thousand, forty-one".