172049851 has 4 divisors (see below), whose sum is σ = 173628400. Its totient is φ = 170471304.

The previous prime is 172049803. The next prime is 172049869. The reversal of 172049851 is 158940271.

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

It is a cyclic number.

It is not a de Polignac number, because 172049851 - 2²³ = 163661243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172049851.

It is not an unprimeable number, because it can be changed into a prime (172049881) 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, 789111 + ... + 789328.

It is an arithmetic number, because the mean of its divisors is an integer number (43407100).

Almost surely, 2^172049851 is an apocalyptic number.

172049851 is a deficient number, since it is larger than the sum of its proper divisors (1578549).

172049851 is a wasteful number, since it uses less digits than its factorization.

172049851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578548.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 172049851 is about 13116.7774624715. Note that the first 3 decimals coincide. The cubic root of 172049851 is about 556.1834994187.

The spelling of 172049851 in words is "one hundred seventy-two million, forty-nine thousand, eight hundred fifty-one".