71578541 has 2 divisors, whose sum is σ = 71578542. Its totient is φ = 71578540.

The previous prime is 71578519. The next prime is 71578543. The reversal of 71578541 is 14587517.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66357316 + 5221225 = 8146^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 71578541 - 2¹⁸ = 71316397 is a prime.

Together with 71578543, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71578495 and 71578504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71578543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35789270 + 35789271.

It is an arithmetic number, because the mean of its divisors is an integer number (35789271).

Almost surely, 2^71578541 is an apocalyptic number.

It is an amenable number.

71578541 is a deficient number, since it is larger than the sum of its proper divisors (1).

71578541 is an equidigital number, since it uses as much as digits as its factorization.

71578541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39200, while the sum is 38.

The square root of 71578541 is about 8460.4102146409. The cubic root of 71578541 is about 415.2034440638.

The spelling of 71578541 in words is "seventy-one million, five hundred seventy-eight thousand, five hundred forty-one".