72129223 has 2 divisors, whose sum is σ = 72129224. Its totient is φ = 72129222.

The previous prime is 72129221. The next prime is 72129247. The reversal of 72129223 is 32292127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72129223 - 2¹ = 72129221 is a prime.

Together with 72129221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 72129191 and 72129200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72129221) 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 as a sum of consecutive naturals, namely, 36064611 + 36064612.

It is an arithmetic number, because the mean of its divisors is an integer number (36064612).

Almost surely, 2^72129223 is an apocalyptic number.

72129223 is a deficient number, since it is larger than the sum of its proper divisors (1).

72129223 is an equidigital number, since it uses as much as digits as its factorization.

72129223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 72129223 is about 8492.8924990253. The cubic root of 72129223 is about 416.2654998181.

The spelling of 72129223 in words is "seventy-two million, one hundred twenty-nine thousand, two hundred twenty-three".