515430401 has 4 divisors (see below), whose sum is σ = 515602500. Its totient is φ = 515258304.

The previous prime is 515430367. The next prime is 515430439. The reversal of 515430401 is 104034515.

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

It can be written as a sum of positive squares in 2 ways, for example, as 145829776 + 369600625 = 12076^2 + 19225^2 .

It is a cyclic number.

It is not a de Polignac number, because 515430401 - 2⁶ = 515430337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (515430451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81476 + ... + 87573.

It is an arithmetic number, because the mean of its divisors is an integer number (128900625).

Almost surely, 2^515430401 is an apocalyptic number.

It is an amenable number.

515430401 is a deficient number, since it is larger than the sum of its proper divisors (172099).

515430401 is a wasteful number, since it uses less digits than its factorization.

515430401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172098.

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

The square root of 515430401 is about 22703.0923224128. The cubic root of 515430401 is about 801.7826917494.

Adding to 515430401 its reverse (104034515), we get a palindrome (619464916).

The spelling of 515430401 in words is "five hundred fifteen million, four hundred thirty thousand, four hundred one".