71023649 has 2 divisors, whose sum is σ = 71023650. Its totient is φ = 71023648.

The previous prime is 71023633. The next prime is 71023651. The reversal of 71023649 is 94632017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68973025 + 2050624 = 8305^2 + 1432^2 .

It is a cyclic number.

It is not a de Polignac number, because 71023649 - 2⁴ = 71023633 is a prime.

It is a Sophie Germain prime.

Together with 71023651, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71023679) 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, 35511824 + 35511825.

It is an arithmetic number, because the mean of its divisors is an integer number (35511825).

Almost surely, 2^71023649 is an apocalyptic number.

It is an amenable number.

71023649 is a deficient number, since it is larger than the sum of its proper divisors (1).

71023649 is an equidigital number, since it uses as much as digits as its factorization.

71023649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 71023649 is about 8427.5529663123. The cubic root of 71023649 is about 414.1277445800.

The spelling of 71023649 in words is "seventy-one million, twenty-three thousand, six hundred forty-nine".