2116219591 has 4 divisors (see below), whose sum is σ = 2134947312. Its totient is φ = 2097491872.

The previous prime is 2116219583. The next prime is 2116219621. The reversal of 2116219591 is 1959126112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2116219591 - 2³ = 2116219583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2116219591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116219541) 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, 9363691 + ... + 9363916.

It is an arithmetic number, because the mean of its divisors is an integer number (533736828).

Almost surely, 2^2116219591 is an apocalyptic number.

2116219591 is a deficient number, since it is larger than the sum of its proper divisors (18727721).

2116219591 is a wasteful number, since it uses less digits than its factorization.

2116219591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18727720.

The product of its digits is 9720, while the sum is 37.

The square root of 2116219591 is about 46002.3867967739. The cubic root of 2116219591 is about 1283.8676132743.

The spelling of 2116219591 in words is "two billion, one hundred sixteen million, two hundred nineteen thousand, five hundred ninety-one".