2191809676 has 48 divisors (see below), whose sum is σ = 4773484800. Its totient is φ = 859215168.

The previous prime is 2191809649. The next prime is 2191809691. The reversal of 2191809676 is 6769081912.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55606 + ... + 86461.

It is an arithmetic number, because the mean of its divisors is an integer number (99447600).

Almost surely, 2^2191809676 is an apocalyptic number.

It is an amenable number.

2191809676 is an abundant number, since it is smaller than the sum of its proper divisors (2581675124).

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

2191809676 is a wasteful number, since it uses less digits than its factorization.

2191809676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142126 (or 142124 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 2191809676 is about 46816.7670391709. The cubic root of 2191809676 is about 1298.9754602202.

The spelling of 2191809676 in words is "two billion, one hundred ninety-one million, eight hundred nine thousand, six hundred seventy-six".