215125105 has 16 divisors (see below), whose sum is σ = 280615104. Its totient is φ = 157371840.

The previous prime is 215125093. The next prime is 215125109. The reversal of 215125105 is 501521512.

It is a happy number.

It is not a de Polignac number, because 215125105 - 2⁷ = 215124977 is a prime.

It is a super-2 number, since 2×215125105² = 92557621602522050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215125109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8511 + ... + 22420.

It is an arithmetic number, because the mean of its divisors is an integer number (17538444).

Almost surely, 2^215125105 is an apocalyptic number.

It is an amenable number.

215125105 is a deficient number, since it is larger than the sum of its proper divisors (65489999).

215125105 is a wasteful number, since it uses less digits than its factorization.

215125105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31056.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 215125105 is about 14667.1437233021. The cubic root of 215125105 is about 599.1888158317.

Adding to 215125105 its reverse (501521512), we get a palindrome (716646617).

The spelling of 215125105 in words is "two hundred fifteen million, one hundred twenty-five thousand, one hundred five".