1915891056 has 100 divisors (see below), whose sum is σ = 5554570824. Its totient is φ = 637545600.

The previous prime is 1915890997. The next prime is 1915891057. The reversal of 1915891056 is 6501985191.

1915891056 is a `hidden beast` number, since 1 + 9 + 1 + 589 + 10 + 56 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1915891057) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1218751 + ... + 1220321.

Almost surely, 2^1915891056 is an apocalyptic number.

1915891056 is a gapful number since it is divisible by the number (16) 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 1915891056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2777285412).

1915891056 is an abundant number, since it is smaller than the sum of its proper divisors (3638679768).

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

1915891056 is a wasteful number, since it uses less digits than its factorization.

1915891056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532 (or 2517 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 45.

The square root of 1915891056 is about 43770.8927941846. The cubic root of 1915891056 is about 1242.0057410643.

The spelling of 1915891056 in words is "one billion, nine hundred fifteen million, eight hundred ninety-one thousand, fifty-six".