81072011 has 2 divisors, whose sum is σ = 81072012. Its totient is φ = 81072010.

The previous prime is 81071983. The next prime is 81072029. The reversal of 81072011 is 11027018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81072011 - 2¹⁴ = 81055627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81072041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40536005 + 40536006.

It is an arithmetic number, because the mean of its divisors is an integer number (40536006).

Almost surely, 2^81072011 is an apocalyptic number.

81072011 is a deficient number, since it is larger than the sum of its proper divisors (1).

81072011 is an equidigital number, since it uses as much as digits as its factorization.

81072011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 81072011 is about 9003.9997223456. Note that the first 3 decimals coincide. The cubic root of 81072011 is about 432.8030526621.

Adding to 81072011 its reverse (11027018), we get a palindrome (92099029).

The spelling of 81072011 in words is "eighty-one million, seventy-two thousand, eleven".