516445 has 4 divisors (see below), whose sum is σ = 619740. Its totient is φ = 413152.

The previous prime is 516437. The next prime is 516449. The reversal of 516445 is 544615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544615 = 5 ⋅108923.

It can be written as a sum of positive squares in 2 ways, for example, as 79524 + 436921 = 282^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 516445 - 2³ = 516437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51640 + ... + 51649.

It is an arithmetic number, because the mean of its divisors is an integer number (154935).

2⁵¹⁶⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

516445 is a deficient number, since it is larger than the sum of its proper divisors (103295).

516445 is a wasteful number, since it uses less digits than its factorization.

516445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103294.

The product of its digits is 2400, while the sum is 25.

The square root of 516445 is about 718.6410787034. The cubic root of 516445 is about 80.2308436660.

It can be divided in two parts, 516 and 445, that added together give a square (961 = 31²).

The spelling of 516445 in words is "five hundred sixteen thousand, four hundred forty-five".