71918123 has 2 divisors, whose sum is σ = 71918124. Its totient is φ = 71918122.

The previous prime is 71918117. The next prime is 71918153. The reversal of 71918123 is 32181917.

It is a weak prime.

It is an emirp because it is prime and its reverse (32181917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71918123 - 2¹⁸ = 71655979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71918123.

It is not a weakly prime, because it can be changed into another prime (71918113) 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, 35959061 + 35959062.

It is an arithmetic number, because the mean of its divisors is an integer number (35959062).

Almost surely, 2^71918123 is an apocalyptic number.

71918123 is a deficient number, since it is larger than the sum of its proper divisors (1).

71918123 is an equidigital number, since it uses as much as digits as its factorization.

71918123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 71918123 is about 8480.4553533404. The cubic root of 71918123 is about 415.8590094047.

The spelling of 71918123 in words is "seventy-one million, nine hundred eighteen thousand, one hundred twenty-three".