818545 has 24 divisors (see below), whose sum is σ = 1235304. Its totient is φ = 516096.

The previous prime is 818509. The next prime is 818561. The reversal of 818545 is 545818.

It can be written as a sum of positive squares in 4 ways, for example, as 159201 + 659344 = 399^2 + 812^2 .

It is not a de Polignac number, because 818545 - 2¹³ = 810353 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3057 + ... + 3313.

It is an arithmetic number, because the mean of its divisors is an integer number (51471).

2⁸¹⁸⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

818545 is a deficient number, since it is larger than the sum of its proper divisors (416759).

818545 is a wasteful number, since it uses less digits than its factorization.

818545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 282 counting only the distinct ones).

The product of its digits is 6400, while the sum is 31.

The square root of 818545 is about 904.7347677635. The cubic root of 818545 is about 93.5436230617.

The spelling of 818545 in words is "eight hundred eighteen thousand, five hundred forty-five".