921491739385 has 24 divisors (see below), whose sum is σ = 1286446734720. Its totient is φ = 631821353184.

The previous prime is 921491739331. The next prime is 921491739419. The reversal of 921491739385 is 583937194129.

It is not a de Polignac number, because 921491739385 - 2⁷ = 921491739257 is a prime.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2555022 + ... + 2893288.

It is an arithmetic number, because the mean of its divisors is an integer number (53601947280).

Almost surely, 2^921491739385 is an apocalyptic number.

It is an amenable number.

921491739385 is a deficient number, since it is larger than the sum of its proper divisors (364954995335).

921491739385 is a wasteful number, since it uses less digits than its factorization.

921491739385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349405 (or 349398 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 61.

The spelling of 921491739385 in words is "nine hundred twenty-one billion, four hundred ninety-one million, seven hundred thirty-nine thousand, three hundred eighty-five".