172969231 has 4 divisors (see below), whose sum is σ = 173016000. Its totient is φ = 172922464.

The previous prime is 172969229. The next prime is 172969241. The reversal of 172969231 is 132969271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132969271 = 6337 ⋅20983.

It is a cyclic number.

It is not a de Polignac number, because 172969231 - 2¹ = 172969229 is a prime.

It is a super-2 number, since 2×172969231² = 59836709745462722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172969241) 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, 17311 + ... + 25408.

It is an arithmetic number, because the mean of its divisors is an integer number (43254000).

Almost surely, 2^172969231 is an apocalyptic number.

172969231 is a deficient number, since it is larger than the sum of its proper divisors (46769).

172969231 is an equidigital number, since it uses as much as digits as its factorization.

172969231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46768.

The product of its digits is 40824, while the sum is 40.

The square root of 172969231 is about 13151.7767240780. The cubic root of 172969231 is about 557.1724295784.

Adding to 172969231 its sum of digits (40), we get a palindrome (172969271).

The spelling of 172969231 in words is "one hundred seventy-two million, nine hundred sixty-nine thousand, two hundred thirty-one".