987138161 has 2 divisors, whose sum is σ = 987138162. Its totient is φ = 987138160.

The previous prime is 987138157. The next prime is 987138199. The reversal of 987138161 is 161831789.

987138161 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., 985018225 + 2119936 = 31385^2 + 1456^2 .

It is a cyclic number.

It is not a de Polignac number, because 987138161 - 2² = 987138157 is a prime.

It is not a weakly prime, because it can be changed into another prime (987131161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493569080 + 493569081.

It is an arithmetic number, because the mean of its divisors is an integer number (493569081).

Almost surely, 2^987138161 is an apocalyptic number.

It is an amenable number.

987138161 is a deficient number, since it is larger than the sum of its proper divisors (1).

987138161 is an equidigital number, since it uses as much as digits as its factorization.

987138161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 987138161 is about 31418.7549244078. The cubic root of 987138161 is about 995.6942070903.

The spelling of 987138161 in words is "nine hundred eighty-seven million, one hundred thirty-eight thousand, one hundred sixty-one".