1000001161 has 2 divisors, whose sum is σ = 1000001162. Its totient is φ = 1000001160.

The previous prime is 1000001137. The next prime is 1000001203. The reversal of 1000001161 is 1611000001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 761484025 + 238517136 = 27595^2 + 15444^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000001161 - 2¹¹ = 999999113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000002161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500000580 + 500000581.

It is an arithmetic number, because the mean of its divisors is an integer number (500000581).

Almost surely, 2^1000001161 is an apocalyptic number.

It is an amenable number.

1000001161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000001161 is an equidigital number, since it uses as much as digits as its factorization.

1000001161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1000001161 is about 31622.7949587003. The cubic root of 1000001161 is about 1000.0003869999. Note that the first 3 decimals are identical.

Adding to 1000001161 its reverse (1611000001), we get a palindrome (2611001162).

It can be divided in two parts, 1000001 and 161, that multiplied together give a palindrome (161000161).

The spelling of 1000001161 in words is "one billion, one thousand, one hundred sixty-one".