168491487 has 16 divisors (see below), whose sum is σ = 236770560. Its totient is φ = 106284672.

The previous prime is 168491483. The next prime is 168491497. The reversal of 168491487 is 784194861.

It is not a de Polignac number, because 168491487 - 2² = 168491483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168491483) 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 15 ways as a sum of consecutive naturals, for example, 68503 + ... + 70919.

It is an arithmetic number, because the mean of its divisors is an integer number (14798160).

Almost surely, 2^168491487 is an apocalyptic number.

168491487 is a deficient number, since it is larger than the sum of its proper divisors (68279073).

168491487 is a wasteful number, since it uses less digits than its factorization.

168491487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662.

The product of its digits is 387072, while the sum is 48.

The square root of 168491487 is about 12980.4270730974. The cubic root of 168491487 is about 552.3223968642.

It can be divided in two parts, 16849 and 1487, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 168491487 in words is "one hundred sixty-eight million, four hundred ninety-one thousand, four hundred eighty-seven".