71321623 has 4 divisors (see below), whose sum is σ = 72667368. Its totient is φ = 69975880.

The previous prime is 71321617. The next prime is 71321693. The reversal of 71321623 is 32612317.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71321623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71321603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672793 + ... + 672898.

It is an arithmetic number, because the mean of its divisors is an integer number (18166842).

Almost surely, 2^71321623 is an apocalyptic number.

71321623 is a deficient number, since it is larger than the sum of its proper divisors (1345745).

71321623 is a wasteful number, since it uses less digits than its factorization.

71321623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345744.

The product of its digits is 1512, while the sum is 25.

The square root of 71321623 is about 8445.2130227721. The cubic root of 71321623 is about 414.7060830762.

The spelling of 71321623 in words is "seventy-one million, three hundred twenty-one thousand, six hundred twenty-three".