172442197 has 4 divisors (see below), whose sum is σ = 172494540. Its totient is φ = 172389856.

The previous prime is 172442167. The next prime is 172442213. The reversal of 172442197 is 791244271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 791244271 = 4357 ⋅181603.

It can be written as a sum of positive squares in 2 ways, for example, as 102535876 + 69906321 = 10126^2 + 8361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172442197 is a prime.

It is a super-2 number, since 2×172442197² = 59472622612373618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172442147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20872 + ... + 27937.

It is an arithmetic number, because the mean of its divisors is an integer number (43123635).

Almost surely, 2^172442197 is an apocalyptic number.

It is an amenable number.

172442197 is a deficient number, since it is larger than the sum of its proper divisors (52343).

172442197 is an equidigital number, since it uses as much as digits as its factorization.

172442197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52342.

The product of its digits is 28224, while the sum is 37.

The square root of 172442197 is about 13131.7248295873. The cubic root of 172442197 is about 556.6059558652.

The spelling of 172442197 in words is "one hundred seventy-two million, four hundred forty-two thousand, one hundred ninety-seven".