1891538056 has 16 divisors (see below), whose sum is σ = 3547789200. Its totient is φ = 945460944.

The previous prime is 1891538017. The next prime is 1891538057. The reversal of 1891538056 is 6508351981.

It is a junction number, because it is equal to n+sod(n) for n = 1891537997 and 1891538015.

It is not an unprimeable number, because it can be changed into a prime (1891538057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11286 + ... + 62533.

It is an arithmetic number, because the mean of its divisors is an integer number (221736825).

Almost surely, 2^1891538056 is an apocalyptic number.

It is an amenable number.

1891538056 is a deficient number, since it is larger than the sum of its proper divisors (1656251144).

1891538056 is a wasteful number, since it uses less digits than its factorization.

1891538056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77028 (or 77024 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 1891538056 is about 43491.8159657653. The cubic root of 1891538056 is about 1236.7208835348.

The spelling of 1891538056 in words is "one billion, eight hundred ninety-one million, five hundred thirty-eight thousand, fifty-six".