161538887 has 2 divisors, whose sum is σ = 161538888. Its totient is φ = 161538886.

The previous prime is 161538841. The next prime is 161538889. The reversal of 161538887 is 788835161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161538887 - 2⁸ = 161538631 is a prime.

Together with 161538889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161538889) 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, 80769443 + 80769444.

It is an arithmetic number, because the mean of its divisors is an integer number (80769444).

Almost surely, 2^161538887 is an apocalyptic number.

161538887 is a deficient number, since it is larger than the sum of its proper divisors (1).

161538887 is an equidigital number, since it uses as much as digits as its factorization.

161538887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 47.

The square root of 161538887 is about 12709.7949236012. The cubic root of 161538887 is about 544.6184653938.

The spelling of 161538887 in words is "one hundred sixty-one million, five hundred thirty-eight thousand, eight hundred eighty-seven".