172257986231 has 4 divisors (see below), whose sum is σ = 172263048600. Its totient is φ = 172252923864.

The previous prime is 172257986221. The next prime is 172257986237. The reversal of 172257986231 is 132689752271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132689752271 = 29 ⋅4575508699.

It is a cyclic number.

It is not a de Polignac number, because 172257986231 - 2¹⁴ = 172257969847 is a prime.

It is a super-2 number, since 2×172257986231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172257986237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2479796 + ... + 2548313.

It is an arithmetic number, because the mean of its divisors is an integer number (43065762150).

Almost surely, 2^172257986231 is an apocalyptic number.

172257986231 is a deficient number, since it is larger than the sum of its proper divisors (5062369).

172257986231 is an equidigital number, since it uses as much as digits as its factorization.

172257986231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062368.

The product of its digits is 2540160, while the sum is 53.

The spelling of 172257986231 in words is "one hundred seventy-two billion, two hundred fifty-seven million, nine hundred eighty-six thousand, two hundred thirty-one".