815140471 has 2 divisors, whose sum is σ = 815140472. Its totient is φ = 815140470.

The previous prime is 815140453. The next prime is 815140511. The reversal of 815140471 is 174041518.

815140471 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 is a cyclic number.

It is not a de Polignac number, because 815140471 - 2⁹ = 815139959 is a prime.

It is a super-3 number, since 3×815140471³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815150471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407570235 + 407570236.

It is an arithmetic number, because the mean of its divisors is an integer number (407570236).

Almost surely, 2^815140471 is an apocalyptic number.

815140471 is a deficient number, since it is larger than the sum of its proper divisors (1).

815140471 is an equidigital number, since it uses as much as digits as its factorization.

815140471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 815140471 is about 28550.6649834991. The cubic root of 815140471 is about 934.1375256594.

Adding to 815140471 its reverse (174041518), we get a palindrome (989181989).

The spelling of 815140471 in words is "eight hundred fifteen million, one hundred forty thousand, four hundred seventy-one".