71843449 has 2 divisors, whose sum is σ = 71843450. Its totient is φ = 71843448.

The previous prime is 71843437. The next prime is 71843489. The reversal of 71843449 is 94434817.

It is an a-pointer prime, because the next prime (71843489) can be obtained adding 71843449 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 5257849 = 8160^2 + 2293^2 .

It is a cyclic number.

It is not a de Polignac number, because 71843449 - 2⁵ = 71843417 is a prime.

It is a super-2 number, since 2×71843449² = 10322962328431202, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71843419) 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, 35921724 + 35921725.

It is an arithmetic number, because the mean of its divisors is an integer number (35921725).

Almost surely, 2^71843449 is an apocalyptic number.

It is an amenable number.

71843449 is a deficient number, since it is larger than the sum of its proper divisors (1).

71843449 is an equidigital number, since it uses as much as digits as its factorization.

71843449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 71843449 is about 8476.0514981918. The cubic root of 71843449 is about 415.7150280339.

The spelling of 71843449 in words is "seventy-one million, eight hundred forty-three thousand, four hundred forty-nine".