72818231 has 2 divisors, whose sum is σ = 72818232. Its totient is φ = 72818230.

The previous prime is 72818227. The next prime is 72818233. The reversal of 72818231 is 13281827.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72818231 - 2² = 72818227 is a prime.

It is a super-2 number, since 2×72818231² = 10604989531938722, which contains 22 as substring.

Together with 72818233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72818233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36409115 + 36409116.

It is an arithmetic number, because the mean of its divisors is an integer number (36409116).

Almost surely, 2^72818231 is an apocalyptic number.

72818231 is a deficient number, since it is larger than the sum of its proper divisors (1).

72818231 is an equidigital number, since it uses as much as digits as its factorization.

72818231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 32.

The square root of 72818231 is about 8533.3598892816. The cubic root of 72818231 is about 417.5867480828.

The spelling of 72818231 in words is "seventy-two million, eight hundred eighteen thousand, two hundred thirty-one".