181372973 has 2 divisors, whose sum is σ = 181372974. Its totient is φ = 181372972.

The previous prime is 181372913. The next prime is 181373111. The reversal of 181372973 is 379273181.

181372973 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., 109767529 + 71605444 = 10477^2 + 8462^2 .

It is a cyclic number.

It is not a de Polignac number, because 181372973 - 2¹² = 181368877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 181372973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181372913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90686486 + 90686487.

It is an arithmetic number, because the mean of its divisors is an integer number (90686487).

Almost surely, 2^181372973 is an apocalyptic number.

It is an amenable number.

181372973 is a deficient number, since it is larger than the sum of its proper divisors (1).

181372973 is an equidigital number, since it uses as much as digits as its factorization.

181372973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 181372973 is about 13467.4783460008. The cubic root of 181372973 is about 566.0535572190.

The spelling of 181372973 in words is "one hundred eighty-one million, three hundred seventy-two thousand, nine hundred seventy-three".