71052581 has 8 divisors (see below), whose sum is σ = 73881720. Its totient is φ = 68248768.

The previous prime is 71052551. The next prime is 71052607. The reversal of 71052581 is 18525017.

It can be written as a sum of positive squares in 4 ways, for example, as 12285025 + 58767556 = 3505^2 + 7666^2 .

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 71052581 - 2¹⁸ = 70790437 is a prime.

It is a super-2 number, since 2×71052581² = 10096938533523122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71052511) 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, 506 + ... + 11931.

It is an arithmetic number, because the mean of its divisors is an integer number (9235215).

Almost surely, 2^71052581 is an apocalyptic number.

It is an amenable number.

71052581 is a deficient number, since it is larger than the sum of its proper divisors (2829139).

71052581 is a wasteful number, since it uses less digits than its factorization.

71052581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12663.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 71052581 is about 8429.2693040382. The cubic root of 71052581 is about 414.1839695958.

Adding to 71052581 its reverse (18525017), we get a palindrome (89577598).

The spelling of 71052581 in words is "seventy-one million, fifty-two thousand, five hundred eighty-one".