2111952961 has 4 divisors (see below), whose sum is σ = 2223108400. Its totient is φ = 2000797524.

The previous prime is 2111952917. The next prime is 2111952979. The reversal of 2111952961 is 1692591112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2111952961 - 2⁷ = 2111952833 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 2111952961.

It is not an unprimeable number, because it can be changed into a prime (2111952901) 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, 55577691 + ... + 55577728.

It is an arithmetic number, because the mean of its divisors is an integer number (555777100).

Almost surely, 2^2111952961 is an apocalyptic number.

It is an amenable number.

2111952961 is a deficient number, since it is larger than the sum of its proper divisors (111155439).

2111952961 is a wasteful number, since it uses less digits than its factorization.

2111952961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111155438.

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

The square root of 2111952961 is about 45955.9893920259. The cubic root of 2111952961 is about 1283.0042067251.

The spelling of 2111952961 in words is "two billion, one hundred eleven million, nine hundred fifty-two thousand, nine hundred sixty-one".