811217241040 has 40 divisors (see below), whose sum is σ = 1921666512168. Its totient is φ = 318364500480.

The previous prime is 811217241011. The next prime is 811217241041. The reversal of 811217241040 is 40142712118.

It can be written as a sum of positive squares in 4 ways, for example, as 400607980096 + 410609260944 = 632936^2 + 640788^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 811217240993 and 811217241011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811217241041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95658171 + ... + 95666650.

Almost surely, 2^811217241040 is an apocalyptic number.

811217241040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

811217241040 is an abundant number, since it is smaller than the sum of its proper divisors (1110449271128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811217241040 is a wasteful number, since it uses less digits than its factorization.

811217241040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191324887 (or 191324881 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

Adding to 811217241040 its reverse (40142712118), we get a palindrome (851359953158).

The spelling of 811217241040 in words is "eight hundred eleven billion, two hundred seventeen million, two hundred forty-one thousand, forty".