816571603 has 2 divisors, whose sum is σ = 816571604. Its totient is φ = 816571602.

The previous prime is 816571549. The next prime is 816571619. The reversal of 816571603 is 306175618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816571603 is a prime.

It is a super-3 number, since 3×816571603³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (816571643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408285801 + 408285802.

It is an arithmetic number, because the mean of its divisors is an integer number (408285802).

Almost surely, 2^816571603 is an apocalyptic number.

816571603 is a deficient number, since it is larger than the sum of its proper divisors (1).

816571603 is an equidigital number, since it uses as much as digits as its factorization.

816571603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 816571603 is about 28575.7170163760. The cubic root of 816571603 is about 934.6838905856.

The spelling of 816571603 in words is "eight hundred sixteen million, five hundred seventy-one thousand, six hundred three".