816315549 has 24 divisors (see below), whose sum is σ = 1268327520. Its totient is φ = 465653664.

The previous prime is 816315527. The next prime is 816315557. The reversal of 816315549 is 945513618.

It is not a de Polignac number, because 816315549 - 2¹⁷ = 816184477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816315549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816315509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85582 + ... + 94640.

It is an arithmetic number, because the mean of its divisors is an integer number (52846980).

Almost surely, 2^816315549 is an apocalyptic number.

It is an amenable number.

816315549 is a deficient number, since it is larger than the sum of its proper divisors (452011971).

816315549 is a wasteful number, since it uses less digits than its factorization.

816315549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9689 (or 9682 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 816315549 is about 28571.2363925680. The cubic root of 816315549 is about 934.5861834696.

The spelling of 816315549 in words is "eight hundred sixteen million, three hundred fifteen thousand, five hundred forty-nine".