817817149 has 4 divisors (see below), whose sum is σ = 824060160. Its totient is φ = 811574140.

The previous prime is 817817111. The next prime is 817817159. The reversal of 817817149 is 941718718.

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.

It is a cyclic number.

It is not a de Polignac number, because 817817149 - 2¹¹ = 817815101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 817817099 and 817817108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817817159) 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, 3121309 + ... + 3121570.

It is an arithmetic number, because the mean of its divisors is an integer number (206015040).

Almost surely, 2^817817149 is an apocalyptic number.

It is an amenable number.

817817149 is a deficient number, since it is larger than the sum of its proper divisors (6243011).

817817149 is a wasteful number, since it uses less digits than its factorization.

817817149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243010.

The product of its digits is 112896, while the sum is 46.

The square root of 817817149 is about 28597.5024958474. The cubic root of 817817149 is about 935.1588847972.

The spelling of 817817149 in words is "eight hundred seventeen million, eight hundred seventeen thousand, one hundred forty-nine".