71744021 has 2 divisors, whose sum is σ = 71744022. Its totient is φ = 71744020.

The previous prime is 71744017. The next prime is 71744053. The reversal of 71744021 is 12044717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60621796 + 11122225 = 7786^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 71744021 - 2² = 71744017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71744821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35872010 + 35872011.

It is an arithmetic number, because the mean of its divisors is an integer number (35872011).

Almost surely, 2^71744021 is an apocalyptic number.

It is an amenable number.

71744021 is a deficient number, since it is larger than the sum of its proper divisors (1).

71744021 is an equidigital number, since it uses as much as digits as its factorization.

71744021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 71744021 is about 8470.1842364851. The cubic root of 71744021 is about 415.5231627256.

Adding to 71744021 its reverse (12044717), we get a palindrome (83788738).

The spelling of 71744021 in words is "seventy-one million, seven hundred forty-four thousand, twenty-one".