811315535909 has 4 divisors (see below), whose sum is σ = 822742515360. Its totient is φ = 799888556460.

The previous prime is 811315535887. The next prime is 811315535971. The reversal of 811315535909 is 909535513118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909535513118 = 2 ⋅454767756559.

It is a cyclic number.

It is not a de Polignac number, because 811315535909 - 2³⁶ = 742596059173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811315535999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5713489619 + ... + 5713489760.

It is an arithmetic number, because the mean of its divisors is an integer number (205685628840).

Almost surely, 2^811315535909 is an apocalyptic number.

It is an amenable number.

811315535909 is a deficient number, since it is larger than the sum of its proper divisors (11426979451).

811315535909 is a wasteful number, since it uses less digits than its factorization.

811315535909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11426979450.

The product of its (nonzero) digits is 729000, while the sum is 50.

The spelling of 811315535909 in words is "eight hundred eleven billion, three hundred fifteen million, five hundred thirty-five thousand, nine hundred nine".