2154801681 has 12 divisors (see below), whose sum is σ = 3184875408. Its totient is φ = 1403126424.

The previous prime is 2154801679. The next prime is 2154801683. The reversal of 2154801681 is 1861084512.

2154801681 is a `hidden beast` number, since 2 + 15 + 480 + 168 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (2154801679) and next prime (2154801683).

It is not a de Polignac number, because 2154801681 - 2¹ = 2154801679 is a prime.

It is a super-3 number, since 3×2154801681³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2154801683) 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 11 ways as a sum of consecutive naturals, for example, 2783595 + ... + 2784368.

It is an arithmetic number, because the mean of its divisors is an integer number (265406284).

Almost surely, 2^2154801681 is an apocalyptic number.

It is an amenable number.

2154801681 is a deficient number, since it is larger than the sum of its proper divisors (1030073727).

2154801681 is a wasteful number, since it uses less digits than its factorization.

2154801681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5568012 (or 5568009 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 2154801681 is about 46419.8414581524. The cubic root of 2154801681 is about 1291.6229959531.

The spelling of 2154801681 in words is "two billion, one hundred fifty-four million, eight hundred one thousand, six hundred eighty-one".