172049523 has 4 divisors (see below), whose sum is σ = 229399368. Its totient is φ = 114699680.

The previous prime is 172049509. The next prime is 172049569. The reversal of 172049523 is 325940271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325940271 = 3 ⋅108646757.

It is a cyclic number.

It is not a de Polignac number, because 172049523 - 2⁵ = 172049491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172049623) 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, 28674918 + ... + 28674923.

It is an arithmetic number, because the mean of its divisors is an integer number (57349842).

Almost surely, 2^172049523 is an apocalyptic number.

172049523 is a deficient number, since it is larger than the sum of its proper divisors (57349845).

172049523 is an equidigital number, since it uses as much as digits as its factorization.

172049523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57349844.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 172049523 is about 13116.7649593945. The cubic root of 172049523 is about 556.1831459779.

Adding to 172049523 its reverse (325940271), we get a palindrome (497989794).

The spelling of 172049523 in words is "one hundred seventy-two million, forty-nine thousand, five hundred twenty-three".