2191899051 has 12 divisors (see below), whose sum is σ = 3268208320. Its totient is φ = 1414128240.

The previous prime is 2191899049. The next prime is 2191899053. The reversal of 2191899051 is 1509981912.

2191899051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2191899049) and next prime (2191899053).

It is not a de Polignac number, because 2191899051 - 2¹ = 2191899049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2191898988 and 2191899006.

It is not an unprimeable number, because it can be changed into a prime (2191899053) 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, 3927856 + ... + 3928413.

Almost surely, 2^2191899051 is an apocalyptic number.

2191899051 is a deficient number, since it is larger than the sum of its proper divisors (1076309269).

2191899051 is a wasteful number, since it uses less digits than its factorization.

2191899051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7856306 (or 7856303 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 45.

The square root of 2191899051 is about 46817.7215485760. The cubic root of 2191899051 is about 1298.9931160041.

The spelling of 2191899051 in words is "two billion, one hundred ninety-one million, eight hundred ninety-nine thousand, fifty-one".