181680797 has 2 divisors, whose sum is σ = 181680798. Its totient is φ = 181680796.

The previous prime is 181680791. The next prime is 181680809. The reversal of 181680797 is 797086181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174530521 + 7150276 = 13211^2 + 2674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181680797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181680791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90840398 + 90840399.

It is an arithmetic number, because the mean of its divisors is an integer number (90840399).

Almost surely, 2^181680797 is an apocalyptic number.

It is an amenable number.

181680797 is a deficient number, since it is larger than the sum of its proper divisors (1).

181680797 is an equidigital number, since it uses as much as digits as its factorization.

181680797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 181680797 is about 13478.9019211507. The cubic root of 181680797 is about 566.3736092913.

The spelling of 181680797 in words is "one hundred eighty-one million, six hundred eighty thousand, seven hundred ninety-seven".