215240081 has 16 divisors (see below), whose sum is σ = 248866560. Its totient is φ = 182347200.

The previous prime is 215240071. The next prime is 215240089. The reversal of 215240081 is 180042512.

It is not a de Polignac number, because 215240081 - 2⁶ = 215240017 is a prime.

It is a super-2 number, since 2×215240081² = 92656584937773122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215240089) 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, 283955 + ... + 284711.

It is an arithmetic number, because the mean of its divisors is an integer number (15554160).

Almost surely, 2^215240081 is an apocalyptic number.

It is an amenable number.

215240081 is a deficient number, since it is larger than the sum of its proper divisors (33626479).

215240081 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (215240080) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1184).

215240081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 215240081 is about 14671.0627086111. The cubic root of 215240081 is about 599.2955445241.

Adding to 215240081 its reverse (180042512), we get a palindrome (395282593).

The spelling of 215240081 in words is "two hundred fifteen million, two hundred forty thousand, eighty-one".