108921687 has 16 divisors (see below), whose sum is σ = 166126080. Its totient is φ = 62184672.

The previous prime is 108921667. The next prime is 108921727. The reversal of 108921687 is 786129801.

It is not a de Polignac number, because 108921687 - 2¹¹ = 108919639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108921667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35989 + ... + 38897.

It is an arithmetic number, because the mean of its divisors is an integer number (10382880).

Almost surely, 2^108921687 is an apocalyptic number.

108921687 is a deficient number, since it is larger than the sum of its proper divisors (57204393).

108921687 is a wasteful number, since it uses less digits than its factorization.

108921687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 108921687 is about 10436.5553225190. Note that the first 3 decimals coincide. The cubic root of 108921687 is about 477.5711901022.

The spelling of 108921687 in words is "one hundred eight million, nine hundred twenty-one thousand, six hundred eighty-seven".