921898813 has 8 divisors (see below), whose sum is σ = 1006218720. Its totient is φ = 837664080.

The previous prime is 921898807. The next prime is 921898841. The reversal of 921898813 is 318898129.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 921898813 - 2⁵ = 921898781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921898013) 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 7 ways as a sum of consecutive naturals, for example, 2506 + ... + 43012.

It is an arithmetic number, because the mean of its divisors is an integer number (125777340).

Almost surely, 2^921898813 is an apocalyptic number.

It is an amenable number.

921898813 is a deficient number, since it is larger than the sum of its proper divisors (84319907).

921898813 is a wasteful number, since it uses less digits than its factorization.

921898813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42587.

The product of its digits is 248832, while the sum is 49.

The square root of 921898813 is about 30362.7866474736. The cubic root of 921898813 is about 973.2574839119.

The spelling of 921898813 in words is "nine hundred twenty-one million, eight hundred ninety-eight thousand, eight hundred thirteen".