181329697 has 2 divisors, whose sum is σ = 181329698. Its totient is φ = 181329696.

The previous prime is 181329689. The next prime is 181329719. The reversal of 181329697 is 796923181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139027681 + 42302016 = 11791^2 + 6504^2 .

It is a cyclic number.

It is not a de Polignac number, because 181329697 - 2³ = 181329689 is a prime.

It is a super-2 number, since 2×181329697² = 65760918028223618, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181329607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90664848 + 90664849.

It is an arithmetic number, because the mean of its divisors is an integer number (90664849).

Almost surely, 2^181329697 is an apocalyptic number.

It is an amenable number.

181329697 is a deficient number, since it is larger than the sum of its proper divisors (1).

181329697 is an equidigital number, since it uses as much as digits as its factorization.

181329697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 181329697 is about 13465.8715648115. The cubic root of 181329697 is about 566.0085330865.

The spelling of 181329697 in words is "one hundred eighty-one million, three hundred twenty-nine thousand, six hundred ninety-seven".