215054011 has 4 divisors (see below), whose sum is σ = 215332992. Its totient is φ = 214775032.

The previous prime is 215053981. The next prime is 215054023. The reversal of 215054011 is 110450512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215054011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215054011.

It is not an unprimeable number, because it can be changed into a prime (215054041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138331 + ... + 139876.

It is an arithmetic number, because the mean of its divisors is an integer number (53833248).

Almost surely, 2^215054011 is an apocalyptic number.

215054011 is a deficient number, since it is larger than the sum of its proper divisors (278981).

215054011 is an equidigital number, since it uses as much as digits as its factorization.

215054011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278980.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 215054011 is about 14664.7199427742. The cubic root of 215054011 is about 599.1228024249.

The spelling of 215054011 in words is "two hundred fifteen million, fifty-four thousand, eleven".