2154479481 has 36 divisors (see below), whose sum is σ = 3949221744. Its totient is φ = 1119207600.

The previous prime is 2154479477. The next prime is 2154479491. The reversal of 2154479481 is 1849744512.

2154479481 is a `hidden beast` number, since 21 + 544 + 7 + 9 + 4 + 81 = 666.

It is not a de Polignac number, because 2154479481 - 2² = 2154479477 is a prime.

It is a super-2 number, since 2×2154479481² = 9283563668100058722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2154479461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 217215 + ... + 226916.

It is an arithmetic number, because the mean of its divisors is an integer number (109700604).

Almost surely, 2^2154479481 is an apocalyptic number.

2154479481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2154479481 is a deficient number, since it is larger than the sum of its proper divisors (1794742263).

2154479481 is a wasteful number, since it uses less digits than its factorization.

2154479481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444162 (or 444152 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 2154479481 is about 46416.3708296976. The cubic root of 2154479481 is about 1291.5586154462.

It can be divided in two parts, 21544 and 79481, that added together give a triangular number (101025 = T₄₄₉).

The spelling of 2154479481 in words is "two billion, one hundred fifty-four million, four hundred seventy-nine thousand, four hundred eighty-one".