172747157 has 4 divisors (see below), whose sum is σ = 188451456. Its totient is φ = 157042860.

The previous prime is 172747151. The next prime is 172747207. The reversal of 172747157 is 751747271.

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 a cyclic number.

It is not a de Polignac number, because 172747157 - 2⁶ = 172747093 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 (172747151) 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, 7852133 + ... + 7852154.

It is an arithmetic number, because the mean of its divisors is an integer number (47112864).

Almost surely, 2^172747157 is an apocalyptic number.

It is an amenable number.

172747157 is a deficient number, since it is larger than the sum of its proper divisors (15704299).

172747157 is a wasteful number, since it uses less digits than its factorization.

172747157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15704298.

The product of its digits is 96040, while the sum is 41.

The square root of 172747157 is about 13143.3312748329. The cubic root of 172747157 is about 556.9338775138.

It can be divided in two parts, 1727 and 47157, that added together give a palindrome (48884).

The spelling of 172747157 in words is "one hundred seventy-two million, seven hundred forty-seven thousand, one hundred fifty-seven".