515438923 has 2 divisors, whose sum is σ = 515438924. Its totient is φ = 515438922.

The previous prime is 515438909. The next prime is 515438933. The reversal of 515438923 is 329834515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 515438923 - 2⁹ = 515438411 is a prime.

It is not a weakly prime, because it can be changed into another prime (515438933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257719461 + 257719462.

It is an arithmetic number, because the mean of its divisors is an integer number (257719462).

Almost surely, 2^515438923 is an apocalyptic number.

515438923 is a deficient number, since it is larger than the sum of its proper divisors (1).

515438923 is an equidigital number, since it uses as much as digits as its factorization.

515438923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The square root of 515438923 is about 22703.2800053208. The cubic root of 515438923 is about 801.7871105513.

The spelling of 515438923 in words is "five hundred fifteen million, four hundred thirty-eight thousand, nine hundred twenty-three".