921086887 has 6 divisors (see below), whose sum is σ = 1052762504. Its totient is φ = 789434220.

The previous prime is 921086879. The next prime is 921086891. The reversal of 921086887 is 788680129.

It is not a de Polignac number, because 921086887 - 2³ = 921086879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921086887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921086087) 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 in 5 ways as a sum of consecutive naturals, for example, 74562 + ... + 86032.

Almost surely, 2^921086887 is an apocalyptic number.

921086887 is a deficient number, since it is larger than the sum of its proper divisors (131675617).

921086887 is an frugal number, since it uses more digits than its factorization.

921086887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22949 (or 11478 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 921086887 is about 30349.4132892219. The cubic root of 921086887 is about 972.9716806179.

The spelling of 921086887 in words is "nine hundred twenty-one million, eighty-six thousand, eight hundred eighty-seven".