812093257 has 4 divisors (see below), whose sum is σ = 812164500. Its totient is φ = 812022016.

The previous prime is 812093239. The next prime is 812093263. The reversal of 812093257 is 752390218.

812093257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 631567161 + 180526096 = 25131^2 + 13436^2 .

It is a 3-Lehmer number, since φ(812093257) divides (812093257-1)³.

It is a cyclic number.

It is not a de Polignac number, because 812093257 - 2²⁷ = 677875529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812093357) 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, 14248 + ... + 42745.

It is an arithmetic number, because the mean of its divisors is an integer number (203041125).

Almost surely, 2^812093257 is an apocalyptic number.

812093257 is the 14249-th decagonal number.

It is an amenable number.

812093257 is a deficient number, since it is larger than the sum of its proper divisors (71243).

812093257 is a wasteful number, since it uses less digits than its factorization.

812093257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71242.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 812093257 is about 28497.2499901306. The cubic root of 812093257 is about 932.9720531846.

The spelling of 812093257 in words is "eight hundred twelve million, ninety-three thousand, two hundred fifty-seven".