1631316161 has 2 divisors, whose sum is σ = 1631316162. Its totient is φ = 1631316160.

The previous prime is 1631316151. The next prime is 1631316173. The reversal of 1631316161 is 1616131361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1229554225 + 401761936 = 35065^2 + 20044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631316161 - 2¹⁰ = 1631315137 is a prime.

It is a super-2 number, since 2×1631316161² = 5322384834279555842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1631316151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815658080 + 815658081.

It is an arithmetic number, because the mean of its divisors is an integer number (815658081).

Almost surely, 2^1631316161 is an apocalyptic number.

It is an amenable number.

1631316161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631316161 is an equidigital number, since it uses as much as digits as its factorization.

1631316161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 1631316161 is about 40389.5550978220. Note that the first 3 decimals coincide. The cubic root of 1631316161 is about 1177.1885959704.

The spelling of 1631316161 in words is "one billion, six hundred thirty-one million, three hundred sixteen thousand, one hundred sixty-one".