813329161 has 2 divisors, whose sum is σ = 813329162. Its totient is φ = 813329160.

The previous prime is 813329137. The next prime is 813329173. The reversal of 813329161 is 161923318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 788767225 + 24561936 = 28085^2 + 4956^2 .

It is a cyclic number.

It is not a de Polignac number, because 813329161 - 2⁵ = 813329129 is a prime.

It is not a weakly prime, because it can be changed into another prime (813329191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406664580 + 406664581.

It is an arithmetic number, because the mean of its divisors is an integer number (406664581).

Almost surely, 2^813329161 is an apocalyptic number.

It is an amenable number.

813329161 is a deficient number, since it is larger than the sum of its proper divisors (1).

813329161 is an equidigital number, since it uses as much as digits as its factorization.

813329161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 813329161 is about 28518.9263647845. The cubic root of 813329161 is about 933.4451020769.

The spelling of 813329161 in words is "eight hundred thirteen million, three hundred twenty-nine thousand, one hundred sixty-one".