2011400081 has 2 divisors, whose sum is σ = 2011400082. Its totient is φ = 2011400080.

The previous prime is 2011400077. The next prime is 2011400129. The reversal of 2011400081 is 1800041102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1698676225 + 312723856 = 41215^2 + 17684^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011400081 - 2² = 2011400077 is a prime.

It is a super-2 number, since 2×2011400081² = 8091460571693613122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2011400381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005700040 + 1005700041.

It is an arithmetic number, because the mean of its divisors is an integer number (1005700041).

Almost surely, 2^2011400081 is an apocalyptic number.

It is an amenable number.

2011400081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011400081 is an equidigital number, since it uses as much as digits as its factorization.

2011400081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 2011400081 is about 44848.6352189228. The cubic root of 2011400081 is about 1262.3103828678.

Adding to 2011400081 its reverse (1800041102), we get a palindrome (3811441183).

The spelling of 2011400081 in words is "two billion, eleven million, four hundred thousand, eighty-one".