172542181 has 12 divisors (see below), whose sum is σ = 201003660. Its totient is φ = 147678720.

The previous prime is 172542157. The next prime is 172542203. The reversal of 172542181 is 181245271.

It can be written as a sum of positive squares in 2 ways, for example, as 112169281 + 60372900 = 10591^2 + 7770^2 .

It is not a de Polignac number, because 172542181 - 2⁷ = 172542053 is a prime.

It is a super-2 number, since 2×172542181² = 59541608448473522, 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 (172542121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38085 + ... + 42373.

It is an arithmetic number, because the mean of its divisors is an integer number (16750305).

Almost surely, 2^172542181 is an apocalyptic number.

It is an amenable number.

172542181 is a deficient number, since it is larger than the sum of its proper divisors (28461479).

172542181 is an equidigital number, since it uses as much as digits as its factorization.

172542181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124 (or 5117 counting only the distinct ones).

The product of its digits is 4480, while the sum is 31.

The square root of 172542181 is about 13135.5312416362. The cubic root of 172542181 is about 556.7135106256.

The spelling of 172542181 in words is "one hundred seventy-two million, five hundred forty-two thousand, one hundred eighty-one".