181380925 has 24 divisors (see below), whose sum is σ = 251358912. Its totient is φ = 128688000.

The previous prime is 181380889. The next prime is 181380929. The reversal of 181380925 is 529083181.

It is not a de Polignac number, because 181380925 - 2²¹ = 179283773 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 (181380929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3232 + ... + 19318.

It is an arithmetic number, because the mean of its divisors is an integer number (10473288).

Almost surely, 2^181380925 is an apocalyptic number.

It is an amenable number.

181380925 is a deficient number, since it is larger than the sum of its proper divisors (69977987).

181380925 is a wasteful number, since it uses less digits than its factorization.

181380925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16149 (or 16144 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 181380925 is about 13467.7735724952. The cubic root of 181380925 is about 566.0618296608.

The spelling of 181380925 in words is "one hundred eighty-one million, three hundred eighty thousand, nine hundred twenty-five".