172228791 has 8 divisors (see below), whose sum is σ = 262443904. Its totient is φ = 98416440.

The previous prime is 172228789. The next prime is 172228799. The reversal of 172228791 is 197822271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 172228791 - 2¹ = 172228789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172228799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4100665 + ... + 4100706.

It is an arithmetic number, because the mean of its divisors is an integer number (32805488).

Almost surely, 2^172228791 is an apocalyptic number.

172228791 is a deficient number, since it is larger than the sum of its proper divisors (90215113).

172228791 is an equidigital number, since it uses as much as digits as its factorization.

172228791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8201381.

The product of its digits is 28224, while the sum is 39.

The square root of 172228791 is about 13123.5967249836. The cubic root of 172228791 is about 556.3762516776.

The spelling of 172228791 in words is "one hundred seventy-two million, two hundred twenty-eight thousand, seven hundred ninety-one".