215008881 has 4 divisors (see below), whose sum is σ = 286678512. Its totient is φ = 143339252.

The previous prime is 215008867. The next prime is 215008897. The reversal of 215008881 is 188800512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215008881 - 2⁶ = 215008817 is a prime.

It is a super-2 number, since 2×215008881² = 92457637817744322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215008861) 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 3 ways as a sum of consecutive naturals, for example, 35834811 + ... + 35834816.

It is an arithmetic number, because the mean of its divisors is an integer number (71669628).

Almost surely, 2^215008881 is an apocalyptic number.

It is an amenable number.

215008881 is a deficient number, since it is larger than the sum of its proper divisors (71669631).

215008881 is an equidigital number, since it uses as much as digits as its factorization.

215008881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71669630.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 215008881 is about 14663.1811350743. The cubic root of 215008881 is about 599.0808900025.

It can be divided in two parts, 21500 and 8881, that added together give a triangular number (30381 = T₂₄₆).

The spelling of 215008881 in words is "two hundred fifteen million, eight thousand, eight hundred eighty-one".