816585919 has 2 divisors, whose sum is σ = 816585920. Its totient is φ = 816585918.

The previous prime is 816585877. The next prime is 816585983. The reversal of 816585919 is 919585618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816585919 - 2¹⁵ = 816553151 is a prime.

It is a super-2 number, since 2×816585919² = 1333625126218149122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816585619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408292959 + 408292960.

It is an arithmetic number, because the mean of its divisors is an integer number (408292960).

Almost surely, 2^816585919 is an apocalyptic number.

816585919 is a deficient number, since it is larger than the sum of its proper divisors (1).

816585919 is an equidigital number, since it uses as much as digits as its factorization.

816585919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 52.

The square root of 816585919 is about 28575.9675076803. The cubic root of 816585919 is about 934.6893527954.

The spelling of 816585919 in words is "eight hundred sixteen million, five hundred eighty-five thousand, nine hundred nineteen".