515213042 has 4 divisors (see below), whose sum is σ = 772819566. Its totient is φ = 257606520.

The previous prime is 515213029. The next prime is 515213051. The reversal of 515213042 is 240312515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 293471161 + 221741881 = 17131^2 + 14891^2 .

It is a junction number, because it is equal to n+sod(n) for n = 515212999 and 515213017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128803259 + ... + 128803262.

Almost surely, 2^515213042 is an apocalyptic number.

515213042 is a deficient number, since it is larger than the sum of its proper divisors (257606524).

515213042 is a wasteful number, since it uses less digits than its factorization.

515213042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257606523.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 515213042 is about 22698.3048265724. The cubic root of 515213042 is about 801.6699709457.

Adding to 515213042 its reverse (240312515), we get a palindrome (755525557).

The spelling of 515213042 in words is "five hundred fifteen million, two hundred thirteen thousand, forty-two".