820575523 has 4 divisors (see below), whose sum is σ = 822622248. Its totient is φ = 818528800.

The previous prime is 820575479. The next prime is 820575527. The reversal of 820575523 is 325575028.

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

It is a cyclic number.

It is not a de Polignac number, because 820575523 - 2¹³ = 820567331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820575527) 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, 1022761 + ... + 1023562.

It is an arithmetic number, because the mean of its divisors is an integer number (205655562).

Almost surely, 2^820575523 is an apocalyptic number.

820575523 is a deficient number, since it is larger than the sum of its proper divisors (2046725).

820575523 is a wasteful number, since it uses less digits than its factorization.

820575523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046724.

The product of its (nonzero) digits is 84000, while the sum is 37.

The square root of 820575523 is about 28645.6894313961. The cubic root of 820575523 is about 936.2090882852.

The spelling of 820575523 in words is "eight hundred twenty million, five hundred seventy-five thousand, five hundred twenty-three".