71530873 has 2 divisors, whose sum is σ = 71530874. Its totient is φ = 71530872.

The previous prime is 71530871. The next prime is 71530889. The reversal of 71530873 is 37803517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70761744 + 769129 = 8412^2 + 877^2 .

It is a cyclic number.

It is not a de Polignac number, because 71530873 - 2¹ = 71530871 is a prime.

Together with 71530871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71530871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35765436 + 35765437.

It is an arithmetic number, because the mean of its divisors is an integer number (35765437).

Almost surely, 2^71530873 is an apocalyptic number.

It is an amenable number.

71530873 is a deficient number, since it is larger than the sum of its proper divisors (1).

71530873 is an equidigital number, since it uses as much as digits as its factorization.

71530873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 71530873 is about 8457.5926243820. The cubic root of 71530873 is about 415.1112548284. Note that the first 3 decimals are identical.

The spelling of 71530873 in words is "seventy-one million, five hundred thirty thousand, eight hundred seventy-three".