2111109961 has 2 divisors, whose sum is σ = 2111109962. Its totient is φ = 2111109960.

The previous prime is 2111109937. The next prime is 2111110019. The reversal of 2111109961 is 1699011112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2095899961 + 15210000 = 45781^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111109961 - 2¹¹ = 2111107913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111109061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055554980 + 1055554981.

It is an arithmetic number, because the mean of its divisors is an integer number (1055554981).

Almost surely, 2^2111109961 is an apocalyptic number.

It is an amenable number.

2111109961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111109961 is an equidigital number, since it uses as much as digits as its factorization.

2111109961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 31.

The square root of 2111109961 is about 45946.8166579579. The cubic root of 2111109961 is about 1282.8334774675.

The spelling of 2111109961 in words is "two billion, one hundred eleven million, one hundred nine thousand, nine hundred sixty-one".