215051765 has 16 divisors (see below), whose sum is σ = 266293440. Its totient is φ = 166615680.

The previous prime is 215051761. The next prime is 215051773. The reversal of 215051765 is 567150512.

It is not a de Polignac number, because 215051765 - 2² = 215051761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215051761) 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 15 ways as a sum of consecutive naturals, for example, 24722 + ... + 32268.

It is an arithmetic number, because the mean of its divisors is an integer number (16643340).

Almost surely, 2^215051765 is an apocalyptic number.

It is an amenable number.

215051765 is a deficient number, since it is larger than the sum of its proper divisors (51241675).

215051765 is a wasteful number, since it uses less digits than its factorization.

215051765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 215051765 is about 14664.6433642281. The cubic root of 215051765 is about 599.1207166939.

The spelling of 215051765 in words is "two hundred fifteen million, fifty-one thousand, seven hundred sixty-five".