813619897 has 4 divisors (see below), whose sum is σ = 815277456. Its totient is φ = 811962340.

The previous prime is 813619837. The next prime is 813619913. The reversal of 813619897 is 798916318.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 798916318 = 2 ⋅399458159.

It is a cyclic number.

It is not a de Polignac number, because 813619897 - 2²³ = 805231289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813619817) 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, 828043 + ... + 829024.

It is an arithmetic number, because the mean of its divisors is an integer number (203819364).

Almost surely, 2^813619897 is an apocalyptic number.

It is an amenable number.

813619897 is a deficient number, since it is larger than the sum of its proper divisors (1657559).

813619897 is a wasteful number, since it uses less digits than its factorization.

813619897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657558.

The product of its digits is 653184, while the sum is 52.

The square root of 813619897 is about 28524.0231559295. The cubic root of 813619897 is about 933.5563132067.

The spelling of 813619897 in words is "eight hundred thirteen million, six hundred nineteen thousand, eight hundred ninety-seven".