921641133609 has 24 divisors (see below), whose sum is σ = 1521472551872. Its totient is φ = 526640577120.

The previous prime is 921641133571. The next prime is 921641133649. The reversal of 921641133609 is 906331146129.

921641133609 is a `hidden beast` number, since 9 + 2 + 1 + 6 + 4 + 1 + 1 + 33 + 609 = 666.

921641133609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 921641133609 - 2⁷ = 921641133481 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (921641133649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3358887 + ... + 3622899.

Almost surely, 2^921641133609 is an apocalyptic number.

It is an amenable number.

921641133609 is a deficient number, since it is larger than the sum of its proper divisors (599831418263).

921641133609 is a wasteful number, since it uses less digits than its factorization.

921641133609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319437 (or 319434 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 921641133609 in words is "nine hundred twenty-one billion, six hundred forty-one million, one hundred thirty-three thousand, six hundred nine".