813810001 has 4 divisors (see below), whose sum is σ = 816706404. Its totient is φ = 810913600.

The previous prime is 813809999. The next prime is 813810013. The reversal of 813810001 is 100018318.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 582739600 + 231070401 = 24140^2 + 15201^2 .

It is a cyclic number.

It is not a de Polignac number, because 813810001 - 2¹ = 813809999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813810091) 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, 1447780 + ... + 1448341.

It is an arithmetic number, because the mean of its divisors is an integer number (204176601).

Almost surely, 2^813810001 is an apocalyptic number.

It is an amenable number.

813810001 is a deficient number, since it is larger than the sum of its proper divisors (2896403).

813810001 is a wasteful number, since it uses less digits than its factorization.

813810001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896402.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 813810001 is about 28527.3553102982. The cubic root of 813810001 is about 933.6290166765.

Adding to 813810001 its reverse (100018318), we get a palindrome (913828319).

The spelling of 813810001 in words is "eight hundred thirteen million, eight hundred ten thousand, one".