172661122 has 4 divisors (see below), whose sum is σ = 258991686. Its totient is φ = 86330560.

The previous prime is 172661117. The next prime is 172661131. The reversal of 172661122 is 221166271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221166271 = 223 ⋅991777.

It can be written as a sum of positive squares in only one way, i.e., 94497841 + 78163281 = 9721^2 + 8841^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43165279 + ... + 43165282.

Almost surely, 2^172661122 is an apocalyptic number.

172661122 is a deficient number, since it is larger than the sum of its proper divisors (86330564).

172661122 is an equidigital number, since it uses as much as digits as its factorization.

172661122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86330563.

The product of its digits is 2016, while the sum is 28.

The square root of 172661122 is about 13140.0579146364. The cubic root of 172661122 is about 556.8414037044.

The spelling of 172661122 in words is "one hundred seventy-two million, six hundred sixty-one thousand, one hundred twenty-two".