816213503 has 8 divisors (see below), whose sum is σ = 987687072. Its totient is φ = 658457856.

The previous prime is 816213499. The next prime is 816213529. The reversal of 816213503 is 305312618.

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

It is not a de Polignac number, because 816213503 - 2² = 816213499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816213553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3429350 + ... + 3429587.

It is an arithmetic number, because the mean of its divisors is an integer number (123460884).

Almost surely, 2^816213503 is an apocalyptic number.

816213503 is a deficient number, since it is larger than the sum of its proper divisors (171473569).

816213503 is a wasteful number, since it uses less digits than its factorization.

816213503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6858961.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 816213503 is about 28569.4505197422. The cubic root of 816213503 is about 934.5472382536.

The spelling of 816213503 in words is "eight hundred sixteen million, two hundred thirteen thousand, five hundred three".