921699085 has 4 divisors (see below), whose sum is σ = 1106038908. Its totient is φ = 737359264.

The previous prime is 921699073. The next prime is 921699133. The reversal of 921699085 is 580996129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 727542729 + 194156356 = 26973^2 + 13934^2 .

It is a cyclic number.

It is not a de Polignac number, because 921699085 - 2¹⁹ = 921174797 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92169904 + ... + 92169913.

It is an arithmetic number, because the mean of its divisors is an integer number (276509727).

Almost surely, 2^921699085 is an apocalyptic number.

It is an amenable number.

921699085 is a deficient number, since it is larger than the sum of its proper divisors (184339823).

921699085 is a wasteful number, since it uses less digits than its factorization.

921699085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184339822.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 921699085 is about 30359.4974431396. The cubic root of 921699085 is about 973.1871939091.

The spelling of 921699085 in words is "nine hundred twenty-one million, six hundred ninety-nine thousand, eighty-five".