2111501081 has 2 divisors, whose sum is σ = 2111501082. Its totient is φ = 2111501080.

The previous prime is 2111501071. The next prime is 2111501149. The reversal of 2111501081 is 1801051112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2108279056 + 3222025 = 45916^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111501081 - 2⁶ = 2111501017 is a prime.

It is a super-2 number, since 2×2111501081² = 8916873630128337122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2111501011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055750540 + 1055750541.

It is an arithmetic number, because the mean of its divisors is an integer number (1055750541).

Almost surely, 2^2111501081 is an apocalyptic number.

It is an amenable number.

2111501081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111501081 is an equidigital number, since it uses as much as digits as its factorization.

2111501081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 20.

The square root of 2111501081 is about 45951.0726860647. The cubic root of 2111501081 is about 1282.9126950128.

Adding to 2111501081 its reverse (1801051112), we get a palindrome (3912552193).

The spelling of 2111501081 in words is "two billion, one hundred eleven million, five hundred one thousand, eighty-one".