71566541 has 2 divisors, whose sum is σ = 71566542. Its totient is φ = 71566540.

The previous prime is 71566463. The next prime is 71566553. The reversal of 71566541 is 14566517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71149225 + 417316 = 8435^2 + 646^2 .

It is a cyclic number.

It is not a de Polignac number, because 71566541 - 2¹⁰ = 71565517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71566241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35783270 + 35783271.

It is an arithmetic number, because the mean of its divisors is an integer number (35783271).

Almost surely, 2^71566541 is an apocalyptic number.

It is an amenable number.

71566541 is a deficient number, since it is larger than the sum of its proper divisors (1).

71566541 is an equidigital number, since it uses as much as digits as its factorization.

71566541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 35.

The square root of 71566541 is about 8459.7009994444. The cubic root of 71566541 is about 415.1802400899.

The spelling of 71566541 in words is "seventy-one million, five hundred sixty-six thousand, five hundred forty-one".