161186687 has 2 divisors, whose sum is σ = 161186688. Its totient is φ = 161186686.

The previous prime is 161186659. The next prime is 161186717. The reversal of 161186687 is 786681161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161186687 - 2¹² = 161182591 is a prime.

It is a super-2 number, since 2×161186687² = 51962296132071938, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161186647) 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, 80593343 + 80593344.

It is an arithmetic number, because the mean of its divisors is an integer number (80593344).

Almost surely, 2^161186687 is an apocalyptic number.

161186687 is a deficient number, since it is larger than the sum of its proper divisors (1).

161186687 is an equidigital number, since it uses as much as digits as its factorization.

161186687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 44.

The square root of 161186687 is about 12695.9319075049. The cubic root of 161186687 is about 544.2223704774. Note that the first 3 decimals are identical.

The spelling of 161186687 in words is "one hundred sixty-one million, one hundred eighty-six thousand, six hundred eighty-seven".