815140289 has 2 divisors, whose sum is σ = 815140290. Its totient is φ = 815140288.

The previous prime is 815140267. The next prime is 815140297. The reversal of 815140289 is 982041518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428821264 + 386319025 = 20708^2 + 19655^2 .

It is a cyclic number.

It is not a de Polignac number, because 815140289 - 2¹² = 815136193 is a prime.

It is not a weakly prime, because it can be changed into another prime (815140219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407570144 + 407570145.

It is an arithmetic number, because the mean of its divisors is an integer number (407570145).

Almost surely, 2^815140289 is an apocalyptic number.

It is an amenable number.

815140289 is a deficient number, since it is larger than the sum of its proper divisors (1).

815140289 is an equidigital number, since it uses as much as digits as its factorization.

815140289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 815140289 is about 28550.6617961826. The cubic root of 815140289 is about 934.1374561364.

The spelling of 815140289 in words is "eight hundred fifteen million, one hundred forty thousand, two hundred eighty-nine".