181008491 has 2 divisors, whose sum is σ = 181008492. Its totient is φ = 181008490.

The previous prime is 181008449. The next prime is 181008523. The reversal of 181008491 is 194800181.

It is an a-pointer prime, because the next prime (181008523) can be obtained adding 181008491 to its sum of digits (32).

It is a strong prime.

It is an emirp because it is prime and its reverse (194800181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181008491 - 2⁶ = 181008427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181005491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90504245 + 90504246.

It is an arithmetic number, because the mean of its divisors is an integer number (90504246).

Almost surely, 2^181008491 is an apocalyptic number.

181008491 is a deficient number, since it is larger than the sum of its proper divisors (1).

181008491 is an equidigital number, since it uses as much as digits as its factorization.

181008491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 181008491 is about 13453.9396089027. The cubic root of 181008491 is about 565.6741278656.

The spelling of 181008491 in words is "one hundred eighty-one million, eight thousand, four hundred ninety-one".