161871587 has 8 divisors (see below), whose sum is σ = 164377680. Its totient is φ = 159373440.

The previous prime is 161871571. The next prime is 161871599. The reversal of 161871587 is 785178161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161871587 - 2⁴ = 161871571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161871527) 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 in 7 ways as a sum of consecutive naturals, for example, 48839 + ... + 52047.

It is an arithmetic number, because the mean of its divisors is an integer number (20547210).

Almost surely, 2^161871587 is an apocalyptic number.

161871587 is a deficient number, since it is larger than the sum of its proper divisors (2506093).

161871587 is an equidigital number, since it uses as much as digits as its factorization.

161871587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973.

The product of its digits is 94080, while the sum is 44.

The square root of 161871587 is about 12722.8765222335. The cubic root of 161871587 is about 544.9921015605.

The spelling of 161871587 in words is "one hundred sixty-one million, eight hundred seventy-one thousand, five hundred eighty-seven".