2154218725 has 12 divisors (see below), whose sum is σ = 2672836740. Its totient is φ = 1722339200.

The previous prime is 2154218719. The next prime is 2154218743. The reversal of 2154218725 is 5278124512.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 19131876 + 2135086849 = 4374^2 + 46207^2 .

It is not a de Polignac number, because 2154218725 - 2¹⁷ = 2154087653 is a prime.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 17991 + ... + 68059.

It is an arithmetic number, because the mean of its divisors is an integer number (222736395).

Almost surely, 2^2154218725 is an apocalyptic number.

2154218725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2154218725 is a deficient number, since it is larger than the sum of its proper divisors (518618015).

2154218725 is a wasteful number, since it uses less digits than its factorization.

2154218725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51800 (or 51795 counting only the distinct ones).

The product of its digits is 44800, while the sum is 37.

The square root of 2154218725 is about 46413.5618650411. The cubic root of 2154218725 is about 1291.5065076944.

The spelling of 2154218725 in words is "two billion, one hundred fifty-four million, two hundred eighteen thousand, seven hundred twenty-five".