811623143 has 2 divisors, whose sum is σ = 811623144. Its totient is φ = 811623142.

The previous prime is 811623107. The next prime is 811623187. The reversal of 811623143 is 341326118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 811623143 - 2¹² = 811619047 is a prime.

It is equal to p_41713292 and since 811623143 and 41713292 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811623443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405811571 + 405811572.

It is an arithmetic number, because the mean of its divisors is an integer number (405811572).

Almost surely, 2^811623143 is an apocalyptic number.

811623143 is a deficient number, since it is larger than the sum of its proper divisors (1).

811623143 is an equidigital number, since it uses as much as digits as its factorization.

811623143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 811623143 is about 28489.0003861139. Note that the first 3 decimals coincide. The cubic root of 811623143 is about 932.7919885259.

The spelling of 811623143 in words is "eight hundred eleven million, six hundred twenty-three thousand, one hundred forty-three".