71847481 has 2 divisors, whose sum is σ = 71847482. Its totient is φ = 71847480.

The previous prime is 71847473. The next prime is 71847487. The reversal of 71847481 is 18474817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65869456 + 5978025 = 8116^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 71847481 - 2³ = 71847473 is a prime.

It is a super-2 number, since 2×71847481² = 10324121052090722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71847487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35923740 + 35923741.

It is an arithmetic number, because the mean of its divisors is an integer number (35923741).

Almost surely, 2^71847481 is an apocalyptic number.

It is an amenable number.

71847481 is a deficient number, since it is larger than the sum of its proper divisors (1).

71847481 is an equidigital number, since it uses as much as digits as its factorization.

71847481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50176, while the sum is 40.

The square root of 71847481 is about 8476.2893414512. The cubic root of 71847481 is about 415.7228048118.

The spelling of 71847481 in words is "seventy-one million, eight hundred forty-seven thousand, four hundred eighty-one".