1891133292 has 96 divisors (see below), whose sum is σ = 4611366144. Its totient is φ = 602784000.

The previous prime is 1891133291. The next prime is 1891133303. The reversal of 1891133292 is 2923311981.

1891133292 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1891133292² = 7152770256221514528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1891133292.

It is not an unprimeable number, because it can be changed into a prime (1891133291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6827058 + ... + 6827334.

It is an arithmetic number, because the mean of its divisors is an integer number (48035064).

Almost surely, 2^1891133292 is an apocalyptic number.

1891133292 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1891133292 is an abundant number, since it is smaller than the sum of its proper divisors (2720232852).

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

1891133292 is a wasteful number, since it uses less digits than its factorization.

1891133292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 557 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 1891133292 is about 43487.1623815581. The cubic root of 1891133292 is about 1236.6326632987.

The spelling of 1891133292 in words is "one billion, eight hundred ninety-one million, one hundred thirty-three thousand, two hundred ninety-two".