2115571 has 2 divisors, whose sum is σ = 2115572.
Its totient is φ = 2115570.
The previous prime is 2115539. The next prime is 2115629. The reversal of 2115571 is 1755112.
2115571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 2115571 - 25 = 2115539 is a prime.
It is a Chen prime.
It is an Ulam number.
It is the 1455-th Hogben number.
It is not a weakly prime, because it can be changed into another prime (2115511) by changing a digit.
It is a nontrivial repunit in base 1454.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057785 + 1057786.
It is an arithmetic number, because the mean of its divisors is an integer number (1057786).
22115571 is an apocalyptic number.
2115571 is a deficient number, since it is larger than the sum of its proper divisors (1).
2115571 is an equidigital number, since it uses as much as digits as its factorization.
2115571 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 350, while the sum is 22.
The square root of 2115571 is about 1454.5002578205.
The cubic root of 2115571 is about 128.3736437526.
The spelling of 2115571 in words is "two million, one hundred fifteen thousand, five hundred seventy-one".