71391473 has 2 divisors, whose sum is σ = 71391474. Its totient is φ = 71391472.

The previous prime is 71391469. The next prime is 71391499. The reversal of 71391473 is 37419317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59783824 + 11607649 = 7732^2 + 3407^2 .

It is a cyclic number.

It is not a de Polignac number, because 71391473 - 2² = 71391469 is a prime.

It is not a weakly prime, because it can be changed into another prime (71394473) 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, 35695736 + 35695737.

It is an arithmetic number, because the mean of its divisors is an integer number (35695737).

Almost surely, 2^71391473 is an apocalyptic number.

It is an amenable number.

71391473 is a deficient number, since it is larger than the sum of its proper divisors (1).

71391473 is an equidigital number, since it uses as much as digits as its factorization.

71391473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 35.

The square root of 71391473 is about 8449.3474895994. The cubic root of 71391473 is about 414.8414219693.

The spelling of 71391473 in words is "seventy-one million, three hundred ninety-one thousand, four hundred seventy-three".