181684969 has 2 divisors, whose sum is σ = 181684970. Its totient is φ = 181684968.

The previous prime is 181684957. The next prime is 181684991. The reversal of 181684969 is 969486181.

181684969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134281744 + 47403225 = 11588^2 + 6885^2 .

It is a cyclic number.

It is not a de Polignac number, because 181684969 - 2¹³ = 181676777 is a prime.

It is a super-2 number, since 2×181684969² = 66018855921061922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181684999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90842484 + 90842485.

It is an arithmetic number, because the mean of its divisors is an integer number (90842485).

Almost surely, 2^181684969 is an apocalyptic number.

It is an amenable number.

181684969 is a deficient number, since it is larger than the sum of its proper divisors (1).

181684969 is an equidigital number, since it uses as much as digits as its factorization.

181684969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 52.

The square root of 181684969 is about 13479.0566806435. The cubic root of 181684969 is about 566.3779445369.

The spelling of 181684969 in words is "one hundred eighty-one million, six hundred eighty-four thousand, nine hundred sixty-nine".