2111772861 has 24 divisors (see below), whose sum is σ = 3523388544. Its totient is φ = 1204575360.

The previous prime is 2111772851. The next prime is 2111772869. The reversal of 2111772861 is 1682771112.

It is not a de Polignac number, because 2111772861 - 2⁵ = 2111772829 is a prime.

It is a super-2 number, since 2×2111772861² = 8919169232912250642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111772869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 625701 + ... + 629066.

It is an arithmetic number, because the mean of its divisors is an integer number (146807856).

Almost surely, 2^2111772861 is an apocalyptic number.

It is an amenable number.

2111772861 is a deficient number, since it is larger than the sum of its proper divisors (1411615683).

2111772861 is a wasteful number, since it uses less digits than its factorization.

2111772861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254801 (or 1254798 counting only the distinct ones).

The product of its digits is 9408, while the sum is 36.

The square root of 2111772861 is about 45954.0298668136. The cubic root of 2111772861 is about 1282.9677356436.

The spelling of 2111772861 in words is "two billion, one hundred eleven million, seven hundred seventy-two thousand, eight hundred sixty-one".