71569 has 2 divisors, whose sum is σ = 71570. Its totient is φ = 71568.

The previous prime is 71563. The next prime is 71593. The reversal of 71569 is 96517.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67600 + 3969 = 260^2 + 63^2 .

It is an emirp because it is prime and its reverse (96517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71569 - 2⁵ = 71537 is a prime.

It is a super-2 number, since 2×71569² = 10244243522, which contains 22 as substring.

It is a Chen prime.

71569 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (71563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35784 + 35785.

It is an arithmetic number, because the mean of its divisors is an integer number (35785).

2⁷¹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

71569 is a deficient number, since it is larger than the sum of its proper divisors (1).

71569 is an equidigital number, since it uses as much as digits as its factorization.

71569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 28.

The square root of 71569 is about 267.5238307142. The cubic root of 71569 is about 41.5184995182.

It can be divided in two parts, 715 and 69, that added together give a square (784 = 28²).

The spelling of 71569 in words is "seventy-one thousand, five hundred sixty-nine".