172123277 has 4 divisors (see below), whose sum is σ = 175370940. Its totient is φ = 168875616.

The previous prime is 172123267. The next prime is 172123319. The reversal of 172123277 is 772321271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 772321271 = 17 ⋅45430663.

It can be written as a sum of positive squares in 2 ways, for example, as 99720196 + 72403081 = 9986^2 + 8509^2 .

It is a cyclic number.

It is not a de Polignac number, because 172123277 - 2⁶ = 172123213 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 (172123247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623752 + ... + 1623857.

It is an arithmetic number, because the mean of its divisors is an integer number (43842735).

Almost surely, 2^172123277 is an apocalyptic number.

It is an amenable number.

172123277 is a deficient number, since it is larger than the sum of its proper divisors (3247663).

172123277 is an equidigital number, since it uses as much as digits as its factorization.

172123277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247662.

The product of its digits is 8232, while the sum is 32.

The square root of 172123277 is about 13119.5760983349. The cubic root of 172123277 is about 556.2626092837.

The spelling of 172123277 in words is "one hundred seventy-two million, one hundred twenty-three thousand, two hundred seventy-seven".