181125439 has 4 divisors (see below), whose sum is σ = 197591400. Its totient is φ = 164659480.

The previous prime is 181125419. The next prime is 181125487. The reversal of 181125439 is 934521181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934521181 = 11 ⋅84956471.

It is a cyclic number.

It is not a de Polignac number, because 181125439 - 2⁵ = 181125407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181125419) 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, 8232964 + ... + 8232985.

It is an arithmetic number, because the mean of its divisors is an integer number (49397850).

Almost surely, 2^181125439 is an apocalyptic number.

181125439 is a deficient number, since it is larger than the sum of its proper divisors (16465961).

181125439 is a wasteful number, since it uses less digits than its factorization.

181125439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16465960.

The product of its digits is 8640, while the sum is 34.

The square root of 181125439 is about 13458.2851433606. The cubic root of 181125439 is about 565.7959273373.

The spelling of 181125439 in words is "one hundred eighty-one million, one hundred twenty-five thousand, four hundred thirty-nine".