71564243 has 2 divisors, whose sum is σ = 71564244. Its totient is φ = 71564242.

The previous prime is 71564219. The next prime is 71564249. The reversal of 71564243 is 34246517.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71564243 - 2¹² = 71560147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71564249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35782121 + 35782122.

It is an arithmetic number, because the mean of its divisors is an integer number (35782122).

Almost surely, 2^71564243 is an apocalyptic number.

71564243 is a deficient number, since it is larger than the sum of its proper divisors (1).

71564243 is an equidigital number, since it uses as much as digits as its factorization.

71564243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 32.

The square root of 71564243 is about 8459.5651779509. The cubic root of 71564243 is about 415.1757962330.

The spelling of 71564243 in words is "seventy-one million, five hundred sixty-four thousand, two hundred forty-three".