72217201 has 4 divisors (see below), whose sum is σ = 82533952. Its totient is φ = 61900452.

The previous prime is 72217183. The next prime is 72217231. The reversal of 72217201 is 10271227.

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: 10271227 = 269 ⋅38183.

It is a cyclic number.

It is not a de Polignac number, because 72217201 - 2⁵ = 72217169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72217231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5158365 + ... + 5158378.

It is an arithmetic number, because the mean of its divisors is an integer number (20633488).

Almost surely, 2^72217201 is an apocalyptic number.

It is an amenable number.

72217201 is a deficient number, since it is larger than the sum of its proper divisors (10316751).

72217201 is a wasteful number, since it uses less digits than its factorization.

72217201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10316750.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 72217201 is about 8498.0704280442. The cubic root of 72217201 is about 416.4346745529.

Adding to 72217201 its reverse (10271227), we get a palindrome (82488428).

The spelling of 72217201 in words is "seventy-two million, two hundred seventeen thousand, two hundred one".