71651249 has 2 divisors, whose sum is σ = 71651250. Its totient is φ = 71651248.

The previous prime is 71651227. The next prime is 71651273. The reversal of 71651249 is 94215617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55771024 + 15880225 = 7468^2 + 3985^2 .

It is a cyclic number.

It is not a de Polignac number, because 71651249 - 2⁸ = 71650993 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71651219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35825624 + 35825625.

It is an arithmetic number, because the mean of its divisors is an integer number (35825625).

Almost surely, 2^71651249 is an apocalyptic number.

It is an amenable number.

71651249 is a deficient number, since it is larger than the sum of its proper divisors (1).

71651249 is an equidigital number, since it uses as much as digits as its factorization.

71651249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 71651249 is about 8464.7060787720. The cubic root of 71651249 is about 415.3439815103.

The spelling of 71651249 in words is "seventy-one million, six hundred fifty-one thousand, two hundred forty-nine".