215256135 has 16 divisors (see below), whose sum is σ = 344787840. Its totient is φ = 114677280.

The previous prime is 215256127. The next prime is 215256137. The reversal of 215256135 is 531652512.

It is a happy number.

It is not a de Polignac number, because 215256135 - 2³ = 215256127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215256137) 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, 7176 + ... + 21954.

It is an arithmetic number, because the mean of its divisors is an integer number (21549240).

Almost surely, 2^215256135 is an apocalyptic number.

215256135 is a deficient number, since it is larger than the sum of its proper divisors (129531705).

215256135 is a wasteful number, since it uses less digits than its factorization.

215256135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15758.

The product of its digits is 9000, while the sum is 30.

The square root of 215256135 is about 14671.6098298721. The cubic root of 215256135 is about 599.3104439354.

The spelling of 215256135 in words is "two hundred fifteen million, two hundred fifty-six thousand, one hundred thirty-five".