215180881 has 2 divisors, whose sum is σ = 215180882. Its totient is φ = 215180880.

The previous prime is 215180879. The next prime is 215180887. The reversal of 215180881 is 188081512.

215180881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206180881 + 9000000 = 14359^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 215180881 - 2¹ = 215180879 is a prime.

It is a super-2 number, since 2×215180881² = 92605623095872322, which contains 22 as substring.

Together with 215180879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (215180887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107590440 + 107590441.

It is an arithmetic number, because the mean of its divisors is an integer number (107590441).

Almost surely, 2^215180881 is an apocalyptic number.

It is an amenable number.

215180881 is a deficient number, since it is larger than the sum of its proper divisors (1).

215180881 is an equidigital number, since it uses as much as digits as its factorization.

215180881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 34.

The square root of 215180881 is about 14669.0449927730. The cubic root of 215180881 is about 599.2405957289.

The spelling of 215180881 in words is "two hundred fifteen million, one hundred eighty thousand, eight hundred eighty-one".