513442 has 4 divisors (see below), whose sum is σ = 770166. Its totient is φ = 256720.

The previous prime is 513439. The next prime is 513473. The reversal of 513442 is 244315.

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., 505521 + 7921 = 711^2 + 89^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128359 + ... + 128362.

2⁵¹³⁴⁴² is an apocalyptic number.

513442 is a deficient number, since it is larger than the sum of its proper divisors (256724).

513442 is a wasteful number, since it uses less digits than its factorization.

513442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256723.

The product of its digits is 480, while the sum is 19.

The square root of 513442 is about 716.5486724571. The cubic root of 513442 is about 80.0750337688.

Adding to 513442 its reverse (244315), we get a palindrome (757757).

The spelling of 513442 in words is "five hundred thirteen thousand, four hundred forty-two".