181036987 has 2 divisors, whose sum is σ = 181036988. Its totient is φ = 181036986.

The previous prime is 181036981. The next prime is 181037047. The reversal of 181036987 is 789630181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181036987 - 2¹⁹ = 180512699 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (181036981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90518493 + 90518494.

It is an arithmetic number, because the mean of its divisors is an integer number (90518494).

Almost surely, 2^181036987 is an apocalyptic number.

181036987 is a deficient number, since it is larger than the sum of its proper divisors (1).

181036987 is an equidigital number, since it uses as much as digits as its factorization.

181036987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 181036987 is about 13454.9985878855. The cubic root of 181036987 is about 565.7038108269.

The spelling of 181036987 in words is "one hundred eighty-one million, thirty-six thousand, nine hundred eighty-seven".