813050547991 has 8 divisors (see below), whose sum is σ = 939138601104. Its totient is φ = 695658222720.

The previous prime is 813050547973. The next prime is 813050548003. The reversal of 813050547991 is 199745050318.

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 813050547991 - 2¹³ = 813050539799 is a prime.

It is a super-2 number, since 2×813050547991² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813050547901) 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, 2173931760 + ... + 2173932133.

It is an arithmetic number, because the mean of its divisors is an integer number (117392325138).

Almost surely, 2^813050547991 is an apocalyptic number.

813050547991 is a deficient number, since it is larger than the sum of its proper divisors (126088053113).

813050547991 is a wasteful number, since it uses less digits than its factorization.

813050547991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4347863921.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 813050547991 in words is "eight hundred thirteen billion, fifty million, five hundred forty-seven thousand, nine hundred ninety-one".