72249121 has 16 divisors (see below), whose sum is σ = 86019840. Its totient is φ = 59371200.

The previous prime is 72249119. The next prime is 72249131. The reversal of 72249121 is 12194227.

It is not a de Polignac number, because 72249121 - 2¹ = 72249119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72249121.

It is not an unprimeable number, because it can be changed into a prime (72249131) 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 15 ways as a sum of consecutive naturals, for example, 29475 + ... + 31831.

It is an arithmetic number, because the mean of its divisors is an integer number (5376240).

Almost surely, 2^72249121 is an apocalyptic number.

It is an amenable number.

72249121 is a deficient number, since it is larger than the sum of its proper divisors (13770719).

72249121 is a wasteful number, since it uses less digits than its factorization.

72249121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544.

The product of its digits is 2016, while the sum is 28.

The square root of 72249121 is about 8499.9482939604. The cubic root of 72249121 is about 416.4960202188.

The spelling of 72249121 in words is "seventy-two million, two hundred forty-nine thousand, one hundred twenty-one".