2091554440 has 16 divisors (see below), whose sum is σ = 4705997580. Its totient is φ = 836621760.

The previous prime is 2091554431. The next prime is 2091554459. The reversal of 2091554440 is 444551902.

It can be written as a sum of positive squares in 2 ways, for example, as 2046476644 + 45077796 = 45238^2 + 6714^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2091554396 and 2091554405.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26144391 + ... + 26144470.

Almost surely, 2^2091554440 is an apocalyptic number.

2091554440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2091554440 is an abundant number, since it is smaller than the sum of its proper divisors (2614443140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2091554440 is a wasteful number, since it uses less digits than its factorization.

2091554440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52288872 (or 52288868 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 2091554440 is about 45733.5155001231. The cubic root of 2091554440 is about 1278.8601587742.

The spelling of 2091554440 in words is "two billion, ninety-one million, five hundred fifty-four thousand, four hundred forty".