182138881 has 4 divisors (see below), whose sum is σ = 182574000. Its totient is φ = 181703764.

The previous prime is 182138839. The next prime is 182138951. The reversal of 182138881 is 188831281.

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, and also an emirpimes, since its reverse is a distinct semiprime: 188831281 = 41 ⋅4605641.

It is a cyclic number.

It is not a de Polignac number, because 182138881 - 2¹¹ = 182136833 is a prime.

It is a super-2 number, since 2×182138881² = 66349143943864322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (182138381) 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, 216931 + ... + 217768.

It is an arithmetic number, because the mean of its divisors is an integer number (45643500).

Almost surely, 2^182138881 is an apocalyptic number.

It is an amenable number.

182138881 is a deficient number, since it is larger than the sum of its proper divisors (435119).

182138881 is an equidigital number, since it uses as much as digits as its factorization.

182138881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435118.

The product of its digits is 24576, while the sum is 40.

The square root of 182138881 is about 13495.8838539756. The cubic root of 182138881 is about 566.8492217284.

The spelling of 182138881 in words is "one hundred eighty-two million, one hundred thirty-eight thousand, eight hundred eighty-one".