172139349 has 4 divisors (see below), whose sum is σ = 229519136. Its totient is φ = 114759564.

The previous prime is 172139339. The next prime is 172139381. The reversal of 172139349 is 943931271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 172139349 - 2¹⁹ = 171615061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172139309) 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, 28689889 + ... + 28689894.

It is an arithmetic number, because the mean of its divisors is an integer number (57379784).

Almost surely, 2^172139349 is an apocalyptic number.

It is an amenable number.

172139349 is a deficient number, since it is larger than the sum of its proper divisors (57379787).

172139349 is an equidigital number, since it uses as much as digits as its factorization.

172139349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57379786.

The product of its digits is 40824, while the sum is 39.

The square root of 172139349 is about 13120.1886038273. The cubic root of 172139349 is about 556.2799224067.

It can be divided in two parts, 17213 and 9349, that added together give a palindrome (26562).

The spelling of 172139349 in words is "one hundred seventy-two million, one hundred thirty-nine thousand, three hundred forty-nine".