845513 has 4 divisors (see below), whose sum is σ = 853380. Its totient is φ = 837648.

The previous prime is 845491. The next prime is 845531. The reversal of 845513 is 315548.

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 644809 + 200704 = 803^2 + 448^2 .

It is a cyclic number.

It is not a de Polignac number, because 845513 - 2¹⁰ = 844489 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (844513) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 3770 + ... + 3987.

It is an arithmetic number, because the mean of its divisors is an integer number (213345).

2⁸⁴⁵⁵¹³ is an apocalyptic number.

It is an amenable number.

845513 is a deficient number, since it is larger than the sum of its proper divisors (7867).

845513 is a wasteful number, since it uses less digits than its factorization.

845513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866.

The product of its digits is 2400, while the sum is 26.

The square root of 845513 is about 919.5178084192. The cubic root of 845513 is about 94.5598474984.

The spelling of 845513 in words is "eight hundred forty-five thousand, five hundred thirteen".