72445231 has 2 divisors, whose sum is σ = 72445232. Its totient is φ = 72445230.

The previous prime is 72445229. The next prime is 72445249. The reversal of 72445231 is 13254427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72445231 - 2¹ = 72445229 is a prime.

It is a super-2 number, since 2×72445231² = 10496622989286722, which contains 22 as substring.

Together with 72445229, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72445231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72445531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36222615 + 36222616.

It is an arithmetic number, because the mean of its divisors is an integer number (36222616).

Almost surely, 2^72445231 is an apocalyptic number.

72445231 is a deficient number, since it is larger than the sum of its proper divisors (1).

72445231 is an equidigital number, since it uses as much as digits as its factorization.

72445231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 28.

The square root of 72445231 is about 8511.4764289164. The cubic root of 72445231 is about 416.8725195800.

Adding to 72445231 its reverse (13254427), we get a palindrome (85699658).

The spelling of 72445231 in words is "seventy-two million, four hundred forty-five thousand, two hundred thirty-one".