813421001 has 4 divisors (see below), whose sum is σ = 813679104. Its totient is φ = 813162900.

The previous prime is 813420983. The next prime is 813421009. The reversal of 813421001 is 100124318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813421001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813421009) 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, 124265 + ... + 130646.

It is an arithmetic number, because the mean of its divisors is an integer number (203419776).

Almost surely, 2^813421001 is an apocalyptic number.

It is an amenable number.

813421001 is a deficient number, since it is larger than the sum of its proper divisors (258103).

813421001 is a wasteful number, since it uses less digits than its factorization.

813421001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258102.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 813421001 is about 28520.5364781240. The cubic root of 813421001 is about 933.4802351964.

Adding to 813421001 its reverse (100124318), we get a palindrome (913545319).

The spelling of 813421001 in words is "eight hundred thirteen million, four hundred twenty-one thousand, one".