71515000729 has 2 divisors, whose sum is σ = 71515000730. Its totient is φ = 71515000728.

The previous prime is 71515000727. The next prime is 71515000787. The reversal of 71515000729 is 92700051517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52347152025 + 19167848704 = 228795^2 + 138448^2 .

It is a cyclic number.

It is not a de Polignac number, because 71515000729 - 2¹ = 71515000727 is a prime.

It is a super-2 number, since 2×71515000729² (a number of 23 digits) contains 22 as substring.

Together with 71515000727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71515000727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35757500364 + 35757500365.

It is an arithmetic number, because the mean of its divisors is an integer number (35757500365).

Almost surely, 2^71515000729 is an apocalyptic number.

It is an amenable number.

71515000729 is a deficient number, since it is larger than the sum of its proper divisors (1).

71515000729 is an equidigital number, since it uses as much as digits as its factorization.

71515000729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22050, while the sum is 37.

The spelling of 71515000729 in words is "seventy-one billion, five hundred fifteen million, seven hundred twenty-nine", and thus it is an aban number.