816554 has 8 divisors (see below), whose sum is σ = 1239840. Its totient is φ = 403276.

The previous prime is 816547. The next prime is 816559. The reversal of 816554 is 455618.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×816554³ = 1633337700517198392, which contains 333 as substring.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 816554.

It is not an unprimeable number, because it can be changed into a prime (816559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2294 + ... + 2625.

It is an arithmetic number, because the mean of its divisors is an integer number (154980).

2⁸¹⁶⁵⁵⁴ is an apocalyptic number.

816554 is a deficient number, since it is larger than the sum of its proper divisors (423286).

816554 is a wasteful number, since it uses less digits than its factorization.

816554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004.

The product of its digits is 4800, while the sum is 29.

The square root of 816554 is about 903.6337753758. The cubic root of 816554 is about 93.4677174147.

The spelling of 816554 in words is "eight hundred sixteen thousand, five hundred fifty-four".