172143231 has 24 divisors (see below), whose sum is σ = 249676416. Its totient is φ = 105449760.

The previous prime is 172143229. The next prime is 172143259. The reversal of 172143231 is 132341271.

It is a happy number.

It is not a de Polignac number, because 172143231 - 2¹ = 172143229 is a prime.

It is a super-2 number, since 2×172143231² = 59266583958238722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172143331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132696 + ... + 133986.

It is an arithmetic number, because the mean of its divisors is an integer number (10403184).

Almost surely, 2^172143231 is an apocalyptic number.

172143231 is a deficient number, since it is larger than the sum of its proper divisors (77533185).

172143231 is a wasteful number, since it uses less digits than its factorization.

172143231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583 (or 1570 counting only the distinct ones).

The product of its digits is 1008, while the sum is 24.

The square root of 172143231 is about 13120.3365429397. The cubic root of 172143231 is about 556.2841040236.

The spelling of 172143231 in words is "one hundred seventy-two million, one hundred forty-three thousand, two hundred thirty-one".