71521005311 has 8 divisors (see below), whose sum is σ = 83123687040. Its totient is φ = 60264672408.

The previous prime is 71521005251. The next prime is 71521005319. The reversal of 71521005311 is 11350012517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71521005311 - 2¹⁰ = 71521004287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71521005319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86586761 + ... + 86587586.

It is an arithmetic number, because the mean of its divisors is an integer number (10390460880).

Almost surely, 2^71521005311 is an apocalyptic number.

71521005311 is a deficient number, since it is larger than the sum of its proper divisors (11602681729).

71521005311 is a wasteful number, since it uses less digits than its factorization.

71521005311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173174413.

The product of its (nonzero) digits is 1050, while the sum is 26.

Adding to 71521005311 its reverse (11350012517), we get a palindrome (82871017828).

The spelling of 71521005311 in words is "seventy-one billion, five hundred twenty-one million, five thousand, three hundred eleven".