812169 has 24 divisors (see below), whose sum is σ = 1257984. Its totient is φ = 504000.

The previous prime is 812167. The next prime is 812173. The reversal of 812169 is 961218.

It is not a de Polignac number, because 812169 - 2¹ = 812167 is a prime.

It is a super-2 number, since 2×812169² = 1319236969122, which contains 22 as substring.

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

812169 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (812167) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11404 + ... + 11474.

It is an arithmetic number, because the mean of its divisors is an integer number (52416).

2⁸¹²¹⁶⁹ is an apocalyptic number.

It is an amenable number.

812169 is a deficient number, since it is larger than the sum of its proper divisors (445815).

812169 is a wasteful number, since it uses less digits than its factorization.

812169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 146 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 812169 is about 901.2041943977. The cubic root of 812169 is about 93.3001058025.

It can be divided in two parts, 81216 and 9, that added together give a square (81225 = 285²).

The spelling of 812169 in words is "eight hundred twelve thousand, one hundred sixty-nine".