812255506 has 4 divisors (see below), whose sum is σ = 1218383262. Its totient is φ = 406127752.

The previous prime is 812255501. The next prime is 812255527. The reversal of 812255506 is 605552218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605552218 = 2 ⋅302776109.

It can be written as a sum of positive squares in only one way, i.e., 412455481 + 399800025 = 20309^2 + 19995^2 .

It is not an unprimeable number, because it can be changed into a prime (812255501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203063875 + ... + 203063878.

Almost surely, 2^812255506 is an apocalyptic number.

812255506 is a deficient number, since it is larger than the sum of its proper divisors (406127756).

812255506 is a wasteful number, since it uses less digits than its factorization.

812255506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406127755.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 812255506 is about 28500.0965963275. The cubic root of 812255506 is about 933.0341822162.

The spelling of 812255506 in words is "eight hundred twelve million, two hundred fifty-five thousand, five hundred six".