813688061 has 6 divisors (see below), whose sum is σ = 841905210. Its totient is φ = 785481536.

The previous prime is 813688049. The next prime is 813688079. The reversal of 813688061 is 160886318.

It can be written as a sum of positive squares in 3 ways, for example, as 375623161 + 438064900 = 19381^2 + 20930^2 .

It is a de Polignac number, because none of the positive numbers 2^k-813688061 is a prime.

It is a super-2 number, since 2×813688061² = 1324176521227879442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813688021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 150965 + ... + 156261.

It is an arithmetic number, because the mean of its divisors is an integer number (140317535).

Almost surely, 2^813688061 is an apocalyptic number.

It is an amenable number.

813688061 is a deficient number, since it is larger than the sum of its proper divisors (28217149).

813688061 is an frugal number, since it uses more digits than its factorization.

813688061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10623 (or 5326 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 813688061 is about 28525.2179833915. The cubic root of 813688061 is about 933.5823831835.

The spelling of 813688061 in words is "eight hundred thirteen million, six hundred eighty-eight thousand, sixty-one".