172942841 has 2 divisors, whose sum is σ = 172942842. Its totient is φ = 172942840.

The previous prime is 172942817. The next prime is 172942843. The reversal of 172942841 is 148249271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138180025 + 34762816 = 11755^2 + 5896^2 .

It is a cyclic number.

It is not a de Polignac number, because 172942841 - 2¹⁰ = 172941817 is a prime.

Together with 172942843, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 172942795 and 172942804.

It is not a weakly prime, because it can be changed into another prime (172942843) 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 as a sum of consecutive naturals, namely, 86471420 + 86471421.

It is an arithmetic number, because the mean of its divisors is an integer number (86471421).

Almost surely, 2^172942841 is an apocalyptic number.

It is an amenable number.

172942841 is a deficient number, since it is larger than the sum of its proper divisors (1).

172942841 is an equidigital number, since it uses as much as digits as its factorization.

172942841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 172942841 is about 13150.7733993100. The cubic root of 172942841 is about 557.1440921140.

The spelling of 172942841 in words is "one hundred seventy-two million, nine hundred forty-two thousand, eight hundred forty-one".