71145891 has 8 divisors (see below), whose sum is σ = 105401360. Its totient is φ = 47430576.

The previous prime is 71145889. The next prime is 71145913. The reversal of 71145891 is 19854117.

71145891 is a `hidden beast` number, since 71 + 1 + 4 + 589 + 1 = 666.

It is not a de Polignac number, because 71145891 - 2¹ = 71145889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71145871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1317490 + ... + 1317543.

It is an arithmetic number, because the mean of its divisors is an integer number (13175170).

Almost surely, 2^71145891 is an apocalyptic number.

71145891 is a deficient number, since it is larger than the sum of its proper divisors (34255469).

71145891 is a wasteful number, since it uses less digits than its factorization.

71145891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635042 (or 2635036 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 71145891 is about 8434.8023687577. The cubic root of 71145891 is about 414.3651997027.

The spelling of 71145891 in words is "seventy-one million, one hundred forty-five thousand, eight hundred ninety-one".