2011952881 has 4 divisors (see below), whose sum is σ = 2012398564. Its totient is φ = 2011507200.

The previous prime is 2011952879. The next prime is 2011952911. The reversal of 2011952881 is 1882591102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1550390625 + 461562256 = 39375^2 + 21484^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011952881 - 2¹ = 2011952879 is a prime.

It is a super-2 number, since 2×2011952881² = 8095908790728400322, which contains 22 as substring.

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 2011952881.

It is not an unprimeable number, because it can be changed into a prime (2011952821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216000 + ... + 225121.

It is an arithmetic number, because the mean of its divisors is an integer number (503099641).

Almost surely, 2^2011952881 is an apocalyptic number.

It is an amenable number.

2011952881 is a deficient number, since it is larger than the sum of its proper divisors (445683).

2011952881 is an equidigital number, since it uses as much as digits as its factorization.

2011952881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445682.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 2011952881 is about 44854.7977478441. The cubic root of 2011952881 is about 1262.4260139762.

The spelling of 2011952881 in words is "two billion, eleven million, nine hundred fifty-two thousand, eight hundred eighty-one".