71539249 has 2 divisors, whose sum is σ = 71539250. Its totient is φ = 71539248.

The previous prime is 71539243. The next prime is 71539253. The reversal of 71539249 is 94293517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69422224 + 2117025 = 8332^2 + 1455^2 .

It is an emirp because it is prime and its reverse (94293517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71539249 - 2²¹ = 69442097 is a prime.

It is not a weakly prime, because it can be changed into another prime (71539243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35769624 + 35769625.

It is an arithmetic number, because the mean of its divisors is an integer number (35769625).

Almost surely, 2^71539249 is an apocalyptic number.

It is an amenable number.

71539249 is a deficient number, since it is larger than the sum of its proper divisors (1).

71539249 is an equidigital number, since it uses as much as digits as its factorization.

71539249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 71539249 is about 8458.0877862552. The cubic root of 71539249 is about 415.1274568589.

The spelling of 71539249 in words is "seventy-one million, five hundred thirty-nine thousand, two hundred forty-nine".