2191511877939 has 6 divisors (see below), whose sum is σ = 3165517157036. Its totient is φ = 1461007918620.

The previous prime is 2191511877889. The next prime is 2191511877983. The reversal of 2191511877939 is 9397781151912.

2191511877939 is a `hidden beast` number, since 2 + 1 + 9 + 1 + 511 + 87 + 7 + 9 + 39 = 666.

It is not a de Polignac number, because 2191511877939 - 2⁹ = 2191511877427 is a prime.

It is a super-2 number, since 2×2191511877939² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2191511872939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121750659877 + ... + 121750659894.

Almost surely, 2^{2191511877939} is an apocalyptic number.

2191511877939 is a deficient number, since it is larger than the sum of its proper divisors (974005279097).

2191511877939 is a wasteful number, since it uses less digits than its factorization.

2191511877939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243501319777 (or 243501319774 counting only the distinct ones).

The product of its digits is 8573040, while the sum is 63.

The spelling of 2191511877939 in words is "two trillion, one hundred ninety-one billion, five hundred eleven million, eight hundred seventy-seven thousand, nine hundred thirty-nine".