71521510001 has 2 divisors, whose sum is σ = 71521510002. Its totient is φ = 71521510000.

The previous prime is 71521509977. The next prime is 71521510013. The reversal of 71521510001 is 10001512517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41841111601 + 29680398400 = 204551^2 + 172280^2 .

It is a cyclic number.

It is not a de Polignac number, because 71521510001 - 2¹⁰ = 71521508977 is a prime.

It is not a weakly prime, because it can be changed into another prime (71521510091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35760755000 + 35760755001.

It is an arithmetic number, because the mean of its divisors is an integer number (35760755001).

Almost surely, 2^71521510001 is an apocalyptic number.

It is an amenable number.

71521510001 is a deficient number, since it is larger than the sum of its proper divisors (1).

71521510001 is an equidigital number, since it uses as much as digits as its factorization.

71521510001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 23.

The spelling of 71521510001 in words is "seventy-one billion, five hundred twenty-one million, five hundred ten thousand, one".