181825109 has 2 divisors, whose sum is σ = 181825110. Its totient is φ = 181825108.

The previous prime is 181825073. The next prime is 181825129. The reversal of 181825109 is 901528181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138133009 + 43692100 = 11753^2 + 6610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181825109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181825129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90912554 + 90912555.

It is an arithmetic number, because the mean of its divisors is an integer number (90912555).

Almost surely, 2^181825109 is an apocalyptic number.

It is an amenable number.

181825109 is a deficient number, since it is larger than the sum of its proper divisors (1).

181825109 is an equidigital number, since it uses as much as digits as its factorization.

181825109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 181825109 is about 13484.2541135949. The cubic root of 181825109 is about 566.5235295144.

The spelling of 181825109 in words is "one hundred eighty-one million, eight hundred twenty-five thousand, one hundred nine".