215504489 has 2 divisors, whose sum is σ = 215504490. Its totient is φ = 215504488.

The previous prime is 215504453. The next prime is 215504491. The reversal of 215504489 is 984405512.

215504489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 86341264 = 11365^2 + 9292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215504489 is a prime.

It is a super-2 number, since 2×215504489² = 92884369558302242, which contains 22 as substring.

Together with 215504491, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_11888624 and since 215504489 and 11888624 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (215504789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107752244 + 107752245.

It is an arithmetic number, because the mean of its divisors is an integer number (107752245).

Almost surely, 2^215504489 is an apocalyptic number.

It is an amenable number.

215504489 is a deficient number, since it is larger than the sum of its proper divisors (1).

215504489 is an equidigital number, since it uses as much as digits as its factorization.

215504489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 215504489 is about 14680.0711510537. The cubic root of 215504489 is about 599.5408422317.

The spelling of 215504489 in words is "two hundred fifteen million, five hundred four thousand, four hundred eighty-nine".