72209471 has 2 divisors, whose sum is σ = 72209472. Its totient is φ = 72209470.

The previous prime is 72209441. The next prime is 72209477. The reversal of 72209471 is 17490227.

It is a strong prime.

It is an emirp because it is prime and its reverse (17490227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72209471 is a prime.

It is a super-3 number, since 3×72209471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72209477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36104735 + 36104736.

It is an arithmetic number, because the mean of its divisors is an integer number (36104736).

Almost surely, 2^72209471 is an apocalyptic number.

72209471 is a deficient number, since it is larger than the sum of its proper divisors (1).

72209471 is an equidigital number, since it uses as much as digits as its factorization.

72209471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 72209471 is about 8497.6156067452. The cubic root of 72209471 is about 416.4198158819.

Adding to 72209471 its reverse (17490227), we get a palindrome (89699698).

The spelling of 72209471 in words is "seventy-two million, two hundred nine thousand, four hundred seventy-one".