1891319052 has 288 divisors, whose sum is σ = 5752750080. Its totient is φ = 480090240.

The previous prime is 1891319039. The next prime is 1891319069. The reversal of 1891319052 is 2509131981.

It is a self number, because there is not a number n which added to its sum of digits gives 1891319052.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14892213 + ... + 14892339.

Almost surely, 2^1891319052 is an apocalyptic number.

1891319052 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 1891319052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2876375040).

1891319052 is an abundant number, since it is smaller than the sum of its proper divisors (3861431028).

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

1891319052 is a wasteful number, since it uses less digits than its factorization.

1891319052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 1891319052 is about 43489.2981318393. The cubic root of 1891319052 is about 1236.6731521356.

The spelling of 1891319052 in words is "one billion, eight hundred ninety-one million, three hundred nineteen thousand, fifty-two".