921601823 has 4 divisors (see below), whose sum is σ = 921679920. Its totient is φ = 921523728.

The previous prime is 921601819. The next prime is 921601861. The reversal of 921601823 is 328106129.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 921601823 - 2² = 921601819 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 921601823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921601523) 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 3 ways as a sum of consecutive naturals, for example, 17315 + ... + 46292.

It is an arithmetic number, because the mean of its divisors is an integer number (230419980).

Almost surely, 2^921601823 is an apocalyptic number.

921601823 is a deficient number, since it is larger than the sum of its proper divisors (78097).

921601823 is a wasteful number, since it uses less digits than its factorization.

921601823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78096.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 921601823 is about 30357.8955627692. The cubic root of 921601823 is about 973.1529609496.

The spelling of 921601823 in words is "nine hundred twenty-one million, six hundred one thousand, eight hundred twenty-three".