72209201 has 4 divisors (see below), whose sum is σ = 73226304. Its totient is φ = 71192100.

The previous prime is 72209173. The next prime is 72209209. The reversal of 72209201 is 10290227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10290227 = 47 ⋅218941.

It is a cyclic number.

It is not a de Polignac number, because 72209201 - 2¹⁰ = 72208177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72209209) 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 3 ways as a sum of consecutive naturals, for example, 508445 + ... + 508586.

It is an arithmetic number, because the mean of its divisors is an integer number (18306576).

Almost surely, 2^72209201 is an apocalyptic number.

72209201 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

72209201 is a deficient number, since it is larger than the sum of its proper divisors (1017103).

72209201 is a wasteful number, since it uses less digits than its factorization.

72209201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017102.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 72209201 is about 8497.5997199209. The cubic root of 72209201 is about 416.4192968665.

Adding to 72209201 its reverse (10290227), we get a palindrome (82499428).

The spelling of 72209201 in words is "seventy-two million, two hundred nine thousand, two hundred one".