215485761 has 8 divisors (see below), whose sum is σ = 304215264. Its totient is φ = 135206720.

The previous prime is 215485729. The next prime is 215485763. The reversal of 215485761 is 167584512.

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 215485761 - 2⁵ = 215485729 is a prime.

It is a super-2 number, since 2×215485761² = 92868226387498242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215485763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2112555 + ... + 2112656.

It is an arithmetic number, because the mean of its divisors is an integer number (38026908).

Almost surely, 2^215485761 is an apocalyptic number.

It is an amenable number.

215485761 is a deficient number, since it is larger than the sum of its proper divisors (88729503).

215485761 is a wasteful number, since it uses less digits than its factorization.

215485761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4225231.

The product of its digits is 67200, while the sum is 39.

The square root of 215485761 is about 14679.4332656271. The cubic root of 215485761 is about 599.5234744169.

The spelling of 215485761 in words is "two hundred fifteen million, four hundred eighty-five thousand, seven hundred sixty-one".