812041787213 has 8 divisors (see below), whose sum is σ = 817376685048. Its totient is φ = 806719140864.

The previous prime is 812041787159. The next prime is 812041787233. The reversal of 812041787213 is 312787140218.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 399244532164 + 412797255049 = 631858^2 + 642493^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 812041787213 - 2⁶ = 812041787149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812041787233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2929856 + ... + 3195017.

It is an arithmetic number, because the mean of its divisors is an integer number (102172085631).

Almost surely, 2^812041787213 is an apocalyptic number.

It is an amenable number.

812041787213 is a deficient number, since it is larger than the sum of its proper divisors (5334897835).

812041787213 is a wasteful number, since it uses less digits than its factorization.

812041787213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6125743.

The product of its (nonzero) digits is 150528, while the sum is 44.

The spelling of 812041787213 in words is "eight hundred twelve billion, forty-one million, seven hundred eighty-seven thousand, two hundred thirteen".