515131423 has 2 divisors, whose sum is σ = 515131424. Its totient is φ = 515131422.

The previous prime is 515131403. The next prime is 515131447. The reversal of 515131423 is 324131515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 515131423 - 2⁹ = 515130911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (515131403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257565711 + 257565712.

It is an arithmetic number, because the mean of its divisors is an integer number (257565712).

Almost surely, 2^515131423 is an apocalyptic number.

515131423 is a deficient number, since it is larger than the sum of its proper divisors (1).

515131423 is an equidigital number, since it uses as much as digits as its factorization.

515131423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 515131423 is about 22696.5068457681. The cubic root of 515131423 is about 801.6276357358.

Adding to 515131423 its reverse (324131515), we get a palindrome (839262938).

The spelling of 515131423 in words is "five hundred fifteen million, one hundred thirty-one thousand, four hundred twenty-three".