181826009 has 2 divisors, whose sum is σ = 181826010. Its totient is φ = 181826008.

The previous prime is 181825981. The next prime is 181826077. The reversal of 181826009 is 900628181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98505625 + 83320384 = 9925^2 + 9128^2 .

It is a cyclic number.

It is not a de Polignac number, because 181826009 - 2¹⁶ = 181760473 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181826009.

It is not a weakly prime, because it can be changed into another prime (181826089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90913004 + 90913005.

It is an arithmetic number, because the mean of its divisors is an integer number (90913005).

Almost surely, 2^181826009 is an apocalyptic number.

It is an amenable number.

181826009 is a deficient number, since it is larger than the sum of its proper divisors (1).

181826009 is an equidigital number, since it uses as much as digits as its factorization.

181826009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 181826009 is about 13484.2874858110. The cubic root of 181826009 is about 566.5244642410.

The spelling of 181826009 in words is "one hundred eighty-one million, eight hundred twenty-six thousand, nine".