71052509 has 4 divisors (see below), whose sum is σ = 77511840. Its totient is φ = 64593180.

The previous prime is 71052473. The next prime is 71052511. The reversal of 71052509 is 90525017.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71052509 - 2¹⁶ = 70986973 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 (71052529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3229649 + ... + 3229670.

It is an arithmetic number, because the mean of its divisors is an integer number (19377960).

Almost surely, 2^71052509 is an apocalyptic number.

It is an amenable number.

71052509 is a deficient number, since it is larger than the sum of its proper divisors (6459331).

71052509 is a wasteful number, since it uses less digits than its factorization.

71052509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6459330.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 71052509 is about 8429.2650332043. The cubic root of 71052509 is about 414.1838296935.

The spelling of 71052509 in words is "seventy-one million, fifty-two thousand, five hundred nine".