813497477 has 8 divisors (see below), whose sum is σ = 892604664. Its totient is φ = 736751808.

The previous prime is 813497471. The next prime is 813497497. The reversal of 813497477 is 774794318.

It can be written as a sum of positive squares in 4 ways, for example, as 33189121 + 780308356 = 5761^2 + 27934^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 813497477 - 2⁸ = 813497221 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 (813497471) 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, 589658 + ... + 591035.

It is an arithmetic number, because the mean of its divisors is an integer number (111575583).

Almost surely, 2^813497477 is an apocalyptic number.

It is an amenable number.

813497477 is a deficient number, since it is larger than the sum of its proper divisors (79107187).

813497477 is a wasteful number, since it uses less digits than its factorization.

813497477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180759.

The product of its digits is 1185408, while the sum is 50.

The square root of 813497477 is about 28521.8771647309. The cubic root of 813497477 is about 933.5094888453.

The spelling of 813497477 in words is "eight hundred thirteen million, four hundred ninety-seven thousand, four hundred seventy-seven".