2191563936 has 72 divisors (see below), whose sum is σ = 6238814400. Its totient is φ = 729753216.

The previous prime is 2191563889. The next prime is 2191563937. The reversal of 2191563936 is 6393651912.

2191563936 is a `hidden beast` number, since 2 + 1 + 9 + 1 + 5 + 639 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 2191563891 and 2191563900.

It is not an unprimeable number, because it can be changed into a prime (2191563937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314215 + ... + 321113.

It is an arithmetic number, because the mean of its divisors is an integer number (86650200).

Almost surely, 2^2191563936 is an apocalyptic number.

It is an amenable number.

2191563936 is an abundant number, since it is smaller than the sum of its proper divisors (4047250464).

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

2191563936 is a wasteful number, since it uses less digits than its factorization.

2191563936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8018 (or 8007 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 2191563936 is about 46814.1424785289. The cubic root of 2191563936 is about 1298.9269124892.

The spelling of 2191563936 in words is "two billion, one hundred ninety-one million, five hundred sixty-three thousand, nine hundred thirty-six".