215186081 has 8 divisors (see below), whose sum is σ = 240474528. Its totient is φ = 190852000.

The previous prime is 215186047. The next prime is 215186087. The reversal of 215186081 is 180681512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215186081 is a prime.

It is a super-2 number, since 2×215186081² = 92610098912277122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215186087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238115 + ... + 239016.

It is an arithmetic number, because the mean of its divisors is an integer number (30059316).

Almost surely, 2^215186081 is an apocalyptic number.

It is an amenable number.

215186081 is a deficient number, since it is larger than the sum of its proper divisors (25288447).

215186081 is a wasteful number, since it uses less digits than its factorization.

215186081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477183.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 215186081 is about 14669.2222356879. Note that the first 4 decimals coincide. The cubic root of 215186081 is about 599.2454227160.

The spelling of 215186081 in words is "two hundred fifteen million, one hundred eighty-six thousand, eighty-one".