2891461520 has 20 divisors (see below), whose sum is σ = 6722648220. Its totient is φ = 1156584576.

The previous prime is 2891461483. The next prime is 2891461561. The reversal of 2891461520 is 251641982.

It can be written as a sum of positive squares in 2 ways, for example, as 2103873424 + 787588096 = 45868^2 + 28064^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 18071555 + ... + 18071714.

It is an arithmetic number, because the mean of its divisors is an integer number (336132411).

Almost surely, 2^2891461520 is an apocalyptic number.

2891461520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2891461520 is an abundant number, since it is smaller than the sum of its proper divisors (3831186700).

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

2891461520 is a wasteful number, since it uses less digits than its factorization.

2891461520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36143282 (or 36143276 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 2891461520 is about 53772.3118342516. The cubic root of 2891461520 is about 1424.6422033885.

The spelling of 2891461520 in words is "two billion, eight hundred ninety-one million, four hundred sixty-one thousand, five hundred twenty".