71564249 has 2 divisors, whose sum is σ = 71564250. Its totient is φ = 71564248.

The previous prime is 71564243. The next prime is 71564261. The reversal of 71564249 is 94246517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36517849 + 35046400 = 6043^2 + 5920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71564249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71564243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35782124 + 35782125.

It is an arithmetic number, because the mean of its divisors is an integer number (35782125).

Almost surely, 2^71564249 is an apocalyptic number.

It is an amenable number.

71564249 is a deficient number, since it is larger than the sum of its proper divisors (1).

71564249 is an equidigital number, since it uses as much as digits as its factorization.

71564249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 71564249 is about 8459.5655325791. The cubic root of 71564249 is about 415.1758078359.

The spelling of 71564249 in words is "seventy-one million, five hundred sixty-four thousand, two hundred forty-nine".