2154248773 has 4 divisors (see below), whose sum is σ = 2206791468. Its totient is φ = 2101706080.

The previous prime is 2154248771. The next prime is 2154248777. The reversal of 2154248773 is 3778424512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 615883489 + 1538365284 = 24817^2 + 39222^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154248773 - 2¹ = 2154248771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154248771) 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, 26271286 + ... + 26271367.

It is an arithmetic number, because the mean of its divisors is an integer number (551697867).

Almost surely, 2^2154248773 is an apocalyptic number.

It is an amenable number.

2154248773 is a deficient number, since it is larger than the sum of its proper divisors (52542695).

2154248773 is an equidigital number, since it uses as much as digits as its factorization.

2154248773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52542694.

The product of its digits is 376320, while the sum is 43.

The square root of 2154248773 is about 46413.8855624047. The cubic root of 2154248773 is about 1291.5125125020.

The spelling of 2154248773 in words is "two billion, one hundred fifty-four million, two hundred forty-eight thousand, seven hundred seventy-three".