1891813841 has 8 divisors (see below), whose sum is σ = 1938795264. Its totient is φ = 1844872480.

The previous prime is 1891813823. The next prime is 1891813849. The reversal of 1891813841 is 1483181981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1891813841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1891813792 and 1891813801.

It is not an unprimeable number, because it can be changed into a prime (1891813849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100520 + ... + 117846.

It is an arithmetic number, because the mean of its divisors is an integer number (242349408).

Almost surely, 2^1891813841 is an apocalyptic number.

It is an amenable number.

1891813841 is a deficient number, since it is larger than the sum of its proper divisors (46981423).

1891813841 is a wasteful number, since it uses less digits than its factorization.

1891813841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20031.

The product of its digits is 55296, while the sum is 44.

The square root of 1891813841 is about 43494.9863892380. The cubic root of 1891813841 is about 1236.7809849768.

The spelling of 1891813841 in words is "one billion, eight hundred ninety-one million, eight hundred thirteen thousand, eight hundred forty-one".