1891321152 has 112 divisors (see below), whose sum is σ = 5776033152. Its totient is φ = 534988800.

The previous prime is 1891321147. The next prime is 1891321171. The reversal of 1891321152 is 2511231981.

It is a tau number, because it is divible by the number of its divisors (112).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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 15 ways as a sum of consecutive naturals, for example, 128778 + ... + 142710.

Almost surely, 2^1891321152 is an apocalyptic number.

1891321152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1891321152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2888016576).

1891321152 is an abundant number, since it is smaller than the sum of its proper divisors (3884712000).

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

1891321152 is a wasteful number, since it uses less digits than its factorization.

1891321152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14056 (or 14046 counting only the distinct ones).

The product of its digits is 4320, while the sum is 33.

The square root of 1891321152 is about 43489.3222757035. The cubic root of 1891321152 is about 1236.6736098431.

The spelling of 1891321152 in words is "one billion, eight hundred ninety-one million, three hundred twenty-one thousand, one hundred fifty-two".