816154393 has 2 divisors, whose sum is σ = 816154394. Its totient is φ = 816154392.

The previous prime is 816154373. The next prime is 816154421. The reversal of 816154393 is 393451618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791184384 + 24970009 = 28128^2 + 4997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816154393 is a prime.

It is a super-2 number, since 2×816154393² = 1332215986426396898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (816154303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408077196 + 408077197.

It is an arithmetic number, because the mean of its divisors is an integer number (408077197).

Almost surely, 2^816154393 is an apocalyptic number.

It is an amenable number.

816154393 is a deficient number, since it is larger than the sum of its proper divisors (1).

816154393 is an equidigital number, since it uses as much as digits as its factorization.

816154393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 816154393 is about 28568.4160043920. The cubic root of 816154393 is about 934.5246778081.

The spelling of 816154393 in words is "eight hundred sixteen million, one hundred fifty-four thousand, three hundred ninety-three".