71185969 has 2 divisors, whose sum is σ = 71185970. Its totient is φ = 71185968.

The previous prime is 71185967. The next prime is 71185991. The reversal of 71185969 is 96958117.

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., 58675600 + 12510369 = 7660^2 + 3537^2 .

It is an emirp because it is prime and its reverse (96958117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71185969 - 2¹ = 71185967 is a prime.

It is a super-2 number, since 2×71185969² = 10134884364937922, which contains 22 as substring.

Together with 71185967, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71185967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35592984 + 35592985.

It is an arithmetic number, because the mean of its divisors is an integer number (35592985).

Almost surely, 2^71185969 is an apocalyptic number.

It is an amenable number.

71185969 is a deficient number, since it is larger than the sum of its proper divisors (1).

71185969 is an equidigital number, since it uses as much as digits as its factorization.

71185969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The square root of 71185969 is about 8437.1777864402. The cubic root of 71185969 is about 414.4429920196.

The spelling of 71185969 in words is "seventy-one million, one hundred eighty-five thousand, nine hundred sixty-nine".