2154005993 has 4 divisors (see below), whose sum is σ = 2154115728. Its totient is φ = 2153896260.

The previous prime is 2154005989. The next prime is 2154006011. The reversal of 2154005993 is 3995004512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, 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 2154005993 - 2² = 2154005989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154005983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16463 + ... + 67668.

It is an arithmetic number, because the mean of its divisors is an integer number (538528932).

Almost surely, 2^2154005993 is an apocalyptic number.

It is an amenable number.

2154005993 is a deficient number, since it is larger than the sum of its proper divisors (109735).

2154005993 is an equidigital number, since it uses as much as digits as its factorization.

2154005993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109734.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 2154005993 is about 46411.2701075935. The cubic root of 2154005993 is about 1291.4639936260.

The spelling of 2154005993 in words is "two billion, one hundred fifty-four million, five thousand, nine hundred ninety-three".