172120771 has 4 divisors (see below), whose sum is σ = 178056000. Its totient is φ = 166185544.

The previous prime is 172120757. The next prime is 172120783. The reversal of 172120771 is 177021271.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 172120771 - 2¹⁵ = 172088003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172121771) 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, 2967571 + ... + 2967628.

It is an arithmetic number, because the mean of its divisors is an integer number (44514000).

Almost surely, 2^172120771 is an apocalyptic number.

172120771 is a deficient number, since it is larger than the sum of its proper divisors (5935229).

172120771 is an equidigital number, since it uses as much as digits as its factorization.

172120771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5935228.

The product of its (nonzero) digits is 1372, while the sum is 28.

The square root of 172120771 is about 13119.4805918527. The cubic root of 172120771 is about 556.2599096665.

The spelling of 172120771 in words is "one hundred seventy-two million, one hundred twenty thousand, seven hundred seventy-one".