172166837 has 6 divisors (see below), whose sum is σ = 182890338. Its totient is φ = 162039104.

The previous prime is 172166807. The next prime is 172166873. The reversal of 172166837 is 738661271.

It can be written as a sum of positive squares in 3 ways, for example, as 32194276 + 139972561 = 5674^2 + 11831^2 .

It is not a de Polignac number, because 172166837 - 2¹² = 172162741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172166794 and 172166803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172166807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 297578 + ... + 298155.

It is an arithmetic number, because the mean of its divisors is an integer number (30481723).

Almost surely, 2^172166837 is an apocalyptic number.

172166837 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

172166837 is a deficient number, since it is larger than the sum of its proper divisors (10723501).

172166837 is an equidigital number, since it uses as much as digits as its factorization.

172166837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595767 (or 595750 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 172166837 is about 13121.2361079282. The cubic root of 172166837 is about 556.3095306064.

The spelling of 172166837 in words is "one hundred seventy-two million, one hundred sixty-six thousand, eight hundred thirty-seven".