1923183730521 has 9 divisors (see below), whose sum is σ = 2777938064629. Its totient is φ = 1282119713436.

The previous prime is 1923183730483. The next prime is 1923183730553. The reversal of 1923183730521 is 1250373813291.

The square root of 1923183730521 is 1386789.

It is a perfect power (a square), and thus also a powerful number.

1923183730521 is a `hidden beast` number, since 1 + 9 + 2 + 318 + 3 + 7 + 305 + 21 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1923183730521 - 2²⁷ = 1923049512793 is a prime.

It is a super-2 number, since 2×1923183730521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1923183730621) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3929236 + ... + 4391498.

Almost surely, 2^{1923183730521} is an apocalyptic number.

1923183730521 is the 1386789-th square number.

1923183730521 is the 693395-th centered octagonal number.

It is an amenable number.

1923183730521 is a deficient number, since it is larger than the sum of its proper divisors (854754334108).

1923183730521 is an frugal number, since it uses more digits than its factorization.

1923183730521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924532 (or 462266 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 1923183730521 in words is "one trillion, nine hundred twenty-three billion, one hundred eighty-three million, seven hundred thirty thousand, five hundred twenty-one".