1320020161 has 2 divisors, whose sum is σ = 1320020162. Its totient is φ = 1320020160.

The previous prime is 1320020077. The next prime is 1320020167. The reversal of 1320020161 is 1610200231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242139536 + 77880625 = 35244^2 + 8825^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320020161 - 2¹¹ = 1320018113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1320020167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660010080 + 660010081.

It is an arithmetic number, because the mean of its divisors is an integer number (660010081).

Almost surely, 2^1320020161 is an apocalyptic number.

It is an amenable number.

1320020161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320020161 is an equidigital number, since it uses as much as digits as its factorization.

1320020161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1320020161 is about 36332.0817047413. The cubic root of 1320020161 is about 1096.9668952654.

Adding to 1320020161 its reverse (1610200231), we get a palindrome (2930220392).

The spelling of 1320020161 in words is "one billion, three hundred twenty million, twenty thousand, one hundred sixty-one".