215105149 has 6 divisors (see below), whose sum is σ = 250224414. Its totient is φ = 184375800.

The previous prime is 215105119. The next prime is 215105153. The reversal of 215105149 is 941501512.

It can be written as a sum of positive squares in only one way, i.e., 133564249 + 81540900 = 11557^2 + 9030^2 .

It is not a de Polignac number, because 215105149 - 2⁵ = 215105117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215105119) 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 5 ways as a sum of consecutive naturals, for example, 2194902 + ... + 2194999.

It is an arithmetic number, because the mean of its divisors is an integer number (41704069).

Almost surely, 2^215105149 is an apocalyptic number.

It is an amenable number.

215105149 is a deficient number, since it is larger than the sum of its proper divisors (35119265).

215105149 is an equidigital number, since it uses as much as digits as its factorization.

215105149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389915 (or 4389908 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 215105149 is about 14666.4634114704. The cubic root of 215105149 is about 599.1702874165.

The spelling of 215105149 in words is "two hundred fifteen million, one hundred five thousand, one hundred forty-nine".