812251 has 8 divisors (see below), whose sum is σ = 908208. Its totient is φ = 720000.

The previous prime is 812249. The next prime is 812257. The reversal of 812251 is 152218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 7-Lehmer number, since φ(812251) divides (812251-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 812251 - 2¹ = 812249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812257) 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 7 ways as a sum of consecutive naturals, for example, 450 + ... + 1351.

It is an arithmetic number, because the mean of its divisors is an integer number (113526).

2⁸¹²²⁵¹ is an apocalyptic number.

812251 is the 451-st decagonal number.

812251 is a deficient number, since it is larger than the sum of its proper divisors (95957).

812251 is a wasteful number, since it uses less digits than its factorization.

812251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853.

The product of its digits is 160, while the sum is 19.

The square root of 812251 is about 901.2496879334. The cubic root of 812251 is about 93.3032456872.

Adding to 812251 its reverse (152218), we get a palindrome (964469).

It can be divided in two parts, 81 and 2251, that added together give a palindrome (2332).

The spelling of 812251 in words is "eight hundred twelve thousand, two hundred fifty-one".