181490501 has 2 divisors, whose sum is σ = 181490502. Its totient is φ = 181490500.

The previous prime is 181490467. The next prime is 181490563. The reversal of 181490501 is 105094181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92659876 + 88830625 = 9626^2 + 9425^2 .

It is a cyclic number.

It is not a de Polignac number, because 181490501 - 2⁶ = 181490437 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181490591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90745250 + 90745251.

It is an arithmetic number, because the mean of its divisors is an integer number (90745251).

Almost surely, 2^181490501 is an apocalyptic number.

It is an amenable number.

181490501 is a deficient number, since it is larger than the sum of its proper divisors (1).

181490501 is an equidigital number, since it uses as much as digits as its factorization.

181490501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 181490501 is about 13471.8410397391. The cubic root of 181490501 is about 566.1757966333.

The spelling of 181490501 in words is "one hundred eighty-one million, four hundred ninety thousand, five hundred one".