71123291 has 16 divisors (see below), whose sum is σ = 79403328. Its totient is φ = 63360000.

The previous prime is 71123279. The next prime is 71123309. The reversal of 71123291 is 19232117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71123291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71123291.

It is not an unprimeable number, because it can be changed into a prime (71123201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38591 + ... + 40391.

It is an arithmetic number, because the mean of its divisors is an integer number (4962708).

Almost surely, 2^71123291 is an apocalyptic number.

71123291 is a deficient number, since it is larger than the sum of its proper divisors (8280037).

71123291 is a wasteful number, since it uses less digits than its factorization.

71123291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942.

The product of its digits is 756, while the sum is 26.

The square root of 71123291 is about 8433.4625747673. The cubic root of 71123291 is about 414.3213197019.

The spelling of 71123291 in words is "seventy-one million, one hundred twenty-three thousand, two hundred ninety-one".