161338871 has 2 divisors, whose sum is σ = 161338872. Its totient is φ = 161338870.

The previous prime is 161338847. The next prime is 161338873. The reversal of 161338871 is 178833161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161338871 is a prime.

It is a Sophie Germain prime.

Together with 161338873, 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 (161338873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80669435 + 80669436.

It is an arithmetic number, because the mean of its divisors is an integer number (80669436).

Almost surely, 2^161338871 is an apocalyptic number.

161338871 is a deficient number, since it is larger than the sum of its proper divisors (1).

161338871 is an equidigital number, since it uses as much as digits as its factorization.

161338871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 161338871 is about 12701.9239093926. The cubic root of 161338871 is about 544.3935919910.

The spelling of 161338871 in words is "one hundred sixty-one million, three hundred thirty-eight thousand, eight hundred seventy-one".