181395673 has 2 divisors, whose sum is σ = 181395674. Its totient is φ = 181395672.

The previous prime is 181395649. The next prime is 181395689. The reversal of 181395673 is 376593181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181387024 + 8649 = 13468^2 + 93^2 .

It is an emirp because it is prime and its reverse (376593181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181395673 is a prime.

It is not a weakly prime, because it can be changed into another prime (181395173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90697836 + 90697837.

It is an arithmetic number, because the mean of its divisors is an integer number (90697837).

Almost surely, 2^181395673 is an apocalyptic number.

It is an amenable number.

181395673 is a deficient number, since it is larger than the sum of its proper divisors (1).

181395673 is an equidigital number, since it uses as much as digits as its factorization.

181395673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 181395673 is about 13468.3210906185. The cubic root of 181395673 is about 566.0771713211.

The spelling of 181395673 in words is "one hundred eighty-one million, three hundred ninety-five thousand, six hundred seventy-three".