816769073 has 2 divisors, whose sum is σ = 816769074. Its totient is φ = 816769072.

The previous prime is 816769027. The next prime is 816769087. The reversal of 816769073 is 370967618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 814360369 + 2408704 = 28537^2 + 1552^2 .

It is a cyclic number.

It is not a de Polignac number, because 816769073 - 2²² = 812574769 is a prime.

It is a super-2 number, since 2×816769073² = 1334223437218558658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (816769013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408384536 + 408384537.

It is an arithmetic number, because the mean of its divisors is an integer number (408384537).

Almost surely, 2^816769073 is an apocalyptic number.

It is an amenable number.

816769073 is a deficient number, since it is larger than the sum of its proper divisors (1).

816769073 is an equidigital number, since it uses as much as digits as its factorization.

816769073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 816769073 is about 28579.1720138985. The cubic root of 816769073 is about 934.7592288049.

The spelling of 816769073 in words is "eight hundred sixteen million, seven hundred sixty-nine thousand, seventy-three".