71845481 has 2 divisors, whose sum is σ = 71845482. Its totient is φ = 71845480.

The previous prime is 71845463. The next prime is 71845483. The reversal of 71845481 is 18454817.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66275881 + 5569600 = 8141^2 + 2360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71845481 is a prime.

It is a super-2 number, since 2×71845481² = 10323546280242722, which contains 22 as substring.

Together with 71845483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71845483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35922740 + 35922741.

It is an arithmetic number, because the mean of its divisors is an integer number (35922741).

Almost surely, 2^71845481 is an apocalyptic number.

It is an amenable number.

71845481 is a deficient number, since it is larger than the sum of its proper divisors (1).

71845481 is an equidigital number, since it uses as much as digits as its factorization.

71845481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35840, while the sum is 38.

The square root of 71845481 is about 8476.1713644782. The cubic root of 71845481 is about 415.7189473194.

The spelling of 71845481 in words is "seventy-one million, eight hundred forty-five thousand, four hundred eighty-one".