811572028243 has 2 divisors, whose sum is σ = 811572028244. Its totient is φ = 811572028242.

The previous prime is 811572028193. The next prime is 811572028273. The reversal of 811572028243 is 342820275118.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811572028243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 811572028243.

It is not a weakly prime, because it can be changed into another prime (811572028273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405786014121 + 405786014122.

It is an arithmetic number, because the mean of its divisors is an integer number (405786014122).

Almost surely, 2^811572028243 is an apocalyptic number.

811572028243 is a deficient number, since it is larger than the sum of its proper divisors (1).

811572028243 is an equidigital number, since it uses as much as digits as its factorization.

811572028243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 811572028243 in words is "eight hundred eleven billion, five hundred seventy-two million, twenty-eight thousand, two hundred forty-three".