71623231 has 4 divisors (see below), whose sum is σ = 73559032. Its totient is φ = 69687432.

The previous prime is 71623199. The next prime is 71623249. The reversal of 71623231 is 13232617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13232617 = 1213 ⋅10909.

It is a cyclic number.

It is not a de Polignac number, because 71623231 - 2⁵ = 71623199 is a prime.

It is a super-2 number, since 2×71623231² = 10259774437758722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71623196 and 71623205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71623271) 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 3 ways as a sum of consecutive naturals, for example, 967845 + ... + 967918.

It is an arithmetic number, because the mean of its divisors is an integer number (18389758).

Almost surely, 2^71623231 is an apocalyptic number.

71623231 is a deficient number, since it is larger than the sum of its proper divisors (1935801).

71623231 is a wasteful number, since it uses less digits than its factorization.

71623231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935800.

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

The square root of 71623231 is about 8463.0509274138. The cubic root of 71623231 is about 415.2898367233.

Adding to 71623231 its reverse (13232617), we get a palindrome (84855848).

The spelling of 71623231 in words is "seventy-one million, six hundred twenty-three thousand, two hundred thirty-one".