71813145 has 32 divisors (see below), whose sum is σ = 118340352. Its totient is φ = 37170432.

The previous prime is 71813129. The next prime is 71813149. The reversal of 71813145 is 54131817.

It is not a de Polignac number, because 71813145 - 2⁴ = 71813129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71813149) 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 in 31 ways as a sum of consecutive naturals, for example, 81447 + ... + 82323.

It is an arithmetic number, because the mean of its divisors is an integer number (3698136).

Almost surely, 2^71813145 is an apocalyptic number.

It is an amenable number.

71813145 is a deficient number, since it is larger than the sum of its proper divisors (46527207).

71813145 is a wasteful number, since it uses less digits than its factorization.

71813145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041.

The product of its digits is 3360, while the sum is 30.

The square root of 71813145 is about 8474.2636848283. The cubic root of 71813145 is about 415.6565694452.

The spelling of 71813145 in words is "seventy-one million, eight hundred thirteen thousand, one hundred forty-five".