71432561 has 2 divisors, whose sum is σ = 71432562. Its totient is φ = 71432560.

The previous prime is 71432531. The next prime is 71432563. The reversal of 71432561 is 16523417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70040161 + 1392400 = 8369^2 + 1180^2 .

It is a cyclic number.

It is not a de Polignac number, because 71432561 - 2¹⁸ = 71170417 is a prime.

It is a super-2 number, since 2×71432561² = 10205221542037442, which contains 22 as substring.

Together with 71432563, 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 (71432563) 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, 35716280 + 35716281.

It is an arithmetic number, because the mean of its divisors is an integer number (35716281).

Almost surely, 2^71432561 is an apocalyptic number.

It is an amenable number.

71432561 is a deficient number, since it is larger than the sum of its proper divisors (1).

71432561 is an equidigital number, since it uses as much as digits as its factorization.

71432561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 71432561 is about 8451.7785702182. The cubic root of 71432561 is about 414.9209913945.

Adding to 71432561 its reverse (16523417), we get a palindrome (87955978).

The spelling of 71432561 in words is "seventy-one million, four hundred thirty-two thousand, five hundred sixty-one".