1009140161 has 4 divisors (see below), whose sum is σ = 1009213524. Its totient is φ = 1009066800.

The previous prime is 1009140151. The next prime is 1009140163. The reversal of 1009140161 is 1610419001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1610419001 = 431 ⋅3736471.

It can be written as a sum of positive squares in 2 ways, for example, as 183439936 + 825700225 = 13544^2 + 28735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1009140161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009140163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9170 + ... + 45851.

It is an arithmetic number, because the mean of its divisors is an integer number (252303381).

It is a Poulet number, since it divides 2^1009140160-1.

Almost surely, 2^1009140161 is an apocalyptic number.

1009140161 is the 18341-st octagonal number.

It is an amenable number.

1009140161 is a deficient number, since it is larger than the sum of its proper divisors (73363).

1009140161 is an equidigital number, since it uses as much as digits as its factorization.

1009140161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73362.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1009140161 is about 31766.9665061050. The cubic root of 1009140161 is about 1003.0374846786.

Adding to 1009140161 its reverse (1610419001), we get a palindrome (2619559162).

The spelling of 1009140161 in words is "one billion, nine million, one hundred forty thousand, one hundred sixty-one".