812845102 has 4 divisors (see below), whose sum is σ = 1219267656. Its totient is φ = 406422550.

The previous prime is 812845097. The next prime is 812845109. The reversal of 812845102 is 201548218.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812845109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203211274 + ... + 203211277.

It is an arithmetic number, because the mean of its divisors is an integer number (304816914).

Almost surely, 2^812845102 is an apocalyptic number.

812845102 is a deficient number, since it is larger than the sum of its proper divisors (406422554).

812845102 is a wasteful number, since it uses less digits than its factorization.

812845102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406422553.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 812845102 is about 28510.4384743553. The cubic root of 812845102 is about 933.2598830237.

The spelling of 812845102 in words is "eight hundred twelve million, eight hundred forty-five thousand, one hundred two".