172088281 has 4 divisors (see below), whose sum is σ = 173402064. Its totient is φ = 170774500.

The previous prime is 172088251. The next prime is 172088311. The reversal of 172088281 is 182880271.

It is the 5356-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (172088251) and next prime (172088311).

It is a cyclic number.

It is not a de Polignac number, because 172088281 - 2⁵ = 172088249 is a prime.

It is a super-2 number, since 2×172088281² = 59228752915069922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172088281.

It is not an unprimeable number, because it can be changed into a prime (172088251) 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, 656695 + ... + 656956.

It is an arithmetic number, because the mean of its divisors is an integer number (43350516).

Almost surely, 2^172088281 is an apocalyptic number.

It is an amenable number.

172088281 is a deficient number, since it is larger than the sum of its proper divisors (1313783).

172088281 is a wasteful number, since it uses less digits than its factorization.

172088281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313782.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 172088281 is about 13118.2422984179. The cubic root of 172088281 is about 556.2249070699.

The spelling of 172088281 in words is "one hundred seventy-two million, eighty-eight thousand, two hundred eighty-one".