100172122 has 4 divisors (see below), whose sum is σ = 150258186. Its totient is φ = 50086060.

The previous prime is 100172113. The next prime is 100172131. The reversal of 100172122 is 221271001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221271001 = 7 ⋅31610143.

It is an interprime number because it is at equal distance from previous prime (100172113) and next prime (100172131).

It can be written as a sum of positive squares in only one way, i.e., 89472681 + 10699441 = 9459^2 + 3271^2 .

It is a junction number, because it is equal to n+sod(n) for n = 100172096 and 100172105.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 25043029 + ... + 25043032.

Almost surely, 2^100172122 is an apocalyptic number.

100172122 is a deficient number, since it is larger than the sum of its proper divisors (50086064).

100172122 is an equidigital number, since it uses as much as digits as its factorization.

100172122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50086063.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 100172122 is about 10008.6023999358. The cubic root of 100172122 is about 464.4250372343.

The spelling of 100172122 in words is "one hundred million, one hundred seventy-two thousand, one hundred twenty-two".