812157 has 4 divisors (see below), whose sum is σ = 1082880. Its totient is φ = 541436.

The previous prime is 812137. The next prime is 812167. The reversal of 812157 is 751218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 812157 - 2¹¹ = 810109 is a prime.

It is a D-number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812137) 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, 135357 + ... + 135362.

It is an arithmetic number, because the mean of its divisors is an integer number (270720).

2⁸¹²¹⁵⁷ is an apocalyptic number.

It is an amenable number.

812157 is a deficient number, since it is larger than the sum of its proper divisors (270723).

812157 is a wasteful number, since it uses less digits than its factorization.

812157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270722.

The product of its digits is 560, while the sum is 24.

The square root of 812157 is about 901.1975366145. The cubic root of 812157 is about 93.2996462894.

It can be divided in two parts, 812 and 157, that added together give a palindrome (969).

The spelling of 812157 in words is "eight hundred twelve thousand, one hundred fifty-seven".