818917049 has 16 divisors (see below), whose sum is σ = 866181120. Its totient is φ = 773070480.

The previous prime is 818917027. The next prime is 818917079. The reversal of 818917049 is 940719818.

It is a cyclic number.

It is not a de Polignac number, because 818917049 - 2⁸ = 818916793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 818916994 and 818917012.

It is not an unprimeable number, because it can be changed into a prime (818917079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551462 + ... + 552944.

It is an arithmetic number, because the mean of its divisors is an integer number (54136320).

Almost surely, 2^818917049 is an apocalyptic number.

It is an amenable number.

818917049 is a deficient number, since it is larger than the sum of its proper divisors (47264071).

818917049 is a wasteful number, since it uses less digits than its factorization.

818917049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 818917049 is about 28616.7267345516. The cubic root of 818917049 is about 935.5779354707.

The spelling of 818917049 in words is "eight hundred eighteen million, nine hundred seventeen thousand, forty-nine".