172201281 has 8 divisors (see below), whose sum is σ = 262401984. Its totient is φ = 98400720.

The previous prime is 172201261. The next prime is 172201291. The reversal of 172201281 is 182102271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 172201281 - 2¹⁹ = 171676993 is a prime.

It is a super-2 number, since 2×172201281² = 59306562356081922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172201241) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 4100010 + ... + 4100051.

It is an arithmetic number, because the mean of its divisors is an integer number (32800248).

Almost surely, 2^172201281 is an apocalyptic number.

It is an amenable number.

172201281 is a deficient number, since it is larger than the sum of its proper divisors (90200703).

172201281 is an equidigital number, since it uses as much as digits as its factorization.

172201281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8200071.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 172201281 is about 13122.5485710665. The cubic root of 172201281 is about 556.3466268868.

The spelling of 172201281 in words is "one hundred seventy-two million, two hundred one thousand, two hundred eighty-one".