172842281 has 16 divisors (see below), whose sum is σ = 189755280. Its totient is φ = 156764160.

The previous prime is 172842251. The next prime is 172842289. The reversal of 172842281 is 182248271.

172842281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1651225 + 171191056 = 1285^2 + 13084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172842281 is a prime.

It is a super-2 number, since 2×172842281² = 59748908202565922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172842289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67301 + ... + 69821.

It is an arithmetic number, because the mean of its divisors is an integer number (11859705).

Almost surely, 2^172842281 is an apocalyptic number.

It is an amenable number.

172842281 is a deficient number, since it is larger than the sum of its proper divisors (16912999).

172842281 is a wasteful number, since it uses less digits than its factorization.

172842281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684.

The product of its digits is 14336, while the sum is 35.

The square root of 172842281 is about 13146.9494940842. The cubic root of 172842281 is about 557.0360848051.

The spelling of 172842281 in words is "one hundred seventy-two million, eight hundred forty-two thousand, two hundred eighty-one".