215885801 has 8 divisors (see below), whose sum is σ = 220362120. Its totient is φ = 211424512.

The previous prime is 215885753. The next prime is 215885827. The reversal of 215885801 is 108588512.

It can be written as a sum of positive squares in 4 ways, for example, as 11424400 + 204461401 = 3380^2 + 14299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215885801 - 2¹⁰ = 215884777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215885101) 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 7 ways as a sum of consecutive naturals, for example, 27995 + ... + 34863.

It is an arithmetic number, because the mean of its divisors is an integer number (27545265).

Almost surely, 2^215885801 is an apocalyptic number.

It is an amenable number.

215885801 is a deficient number, since it is larger than the sum of its proper divisors (4476319).

215885801 is an equidigital number, since it uses as much as digits as its factorization.

215885801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7515.

The product of its (nonzero) digits is 25600, while the sum is 38.

The square root of 215885801 is about 14693.0528141704. The cubic root of 215885801 is about 599.8942415449.

The spelling of 215885801 in words is "two hundred fifteen million, eight hundred eighty-five thousand, eight hundred one".