813857389061 has 32 divisors (see below), whose sum is σ = 854436739968. Its totient is φ = 774529551360.

The previous prime is 813857389057. The next prime is 813857389097. The reversal of 813857389061 is 160983758318.

It is a cyclic number.

It is not a de Polignac number, because 813857389061 - 2² = 813857389057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813557389061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234742250 + ... + 234745716.

It is an arithmetic number, because the mean of its divisors is an integer number (26701148124).

Almost surely, 2^813857389061 is an apocalyptic number.

It is an amenable number.

813857389061 is a deficient number, since it is larger than the sum of its proper divisors (40579350907).

813857389061 is a wasteful number, since it uses less digits than its factorization.

813857389061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4421.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 813857389061 in words is "eight hundred thirteen billion, eight hundred fifty-seven million, three hundred eighty-nine thousand, sixty-one".