181388897 has 2 divisors, whose sum is σ = 181388898. Its totient is φ = 181388896.

The previous prime is 181388873. The next prime is 181388923. The reversal of 181388897 is 798883181.

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., 162588001 + 18800896 = 12751^2 + 4336^2 .

It is a cyclic number.

It is not a de Polignac number, because 181388897 - 2¹⁰ = 181387873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181381897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90694448 + 90694449.

It is an arithmetic number, because the mean of its divisors is an integer number (90694449).

Almost surely, 2^181388897 is an apocalyptic number.

It is an amenable number.

181388897 is a deficient number, since it is larger than the sum of its proper divisors (1).

181388897 is an equidigital number, since it uses as much as digits as its factorization.

181388897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 53.

The square root of 181388897 is about 13468.0695350150. The cubic root of 181388897 is about 566.0701226659.

The spelling of 181388897 in words is "one hundred eighty-one million, three hundred eighty-eight thousand, eight hundred ninety-seven".