32172868181 has 2 divisors, whose sum is σ = 32172868182. Its totient is φ = 32172868180.

The previous prime is 32172868153. The next prime is 32172868183. The reversal of 32172868181 is 18186827123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32115865681 + 57002500 = 179209^2 + 7550^2 .

It is a cyclic number.

It is not a de Polignac number, because 32172868181 - 2³⁴ = 14992998997 is a prime.

It is a super-2 number, since 2×32172868181² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 32172868183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32172868183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16086434090 + 16086434091.

It is an arithmetic number, because the mean of its divisors is an integer number (16086434091).

Almost surely, 2^32172868181 is an apocalyptic number.

It is an amenable number.

32172868181 is a deficient number, since it is larger than the sum of its proper divisors (1).

32172868181 is an equidigital number, since it uses as much as digits as its factorization.

32172868181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 47.

The spelling of 32172868181 in words is "thirty-two billion, one hundred seventy-two million, eight hundred sixty-eight thousand, one hundred eighty-one".