215010881 has 2 divisors, whose sum is σ = 215010882. Its totient is φ = 215010880.

The previous prime is 215010857. The next prime is 215010889. The reversal of 215010881 is 188010512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193071025 + 21939856 = 13895^2 + 4684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215010881 is a prime.

It is a super-2 number, since 2×215010881² = 92459357896792322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215010881.

It is not a weakly prime, because it can be changed into another prime (215010889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107505440 + 107505441.

It is an arithmetic number, because the mean of its divisors is an integer number (107505441).

Almost surely, 2^215010881 is an apocalyptic number.

It is an amenable number.

215010881 is a deficient number, since it is larger than the sum of its proper divisors (1).

215010881 is an equidigital number, since it uses as much as digits as its factorization.

215010881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 215010881 is about 14663.2493329412. The cubic root of 215010881 is about 599.0827475352.

It can be divided in two parts, 2150 and 10881, that added together give a palindrome (13031).

The spelling of 215010881 in words is "two hundred fifteen million, ten thousand, eight hundred eighty-one".