1001165161 has 4 divisors (see below), whose sum is σ = 1001453824. Its totient is φ = 1000876500.

The previous prime is 1001165149. The next prime is 1001165171. The reversal of 1001165161 is 1615611001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1615611001 = 1021 ⋅1582381.

It is a cyclic number.

It is not a de Polignac number, because 1001165161 - 2¹³ = 1001156969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001165131) 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, 139065 + ... + 146086.

It is an arithmetic number, because the mean of its divisors is an integer number (250363456).

Almost surely, 2^1001165161 is an apocalyptic number.

It is an amenable number.

1001165161 is a deficient number, since it is larger than the sum of its proper divisors (288663).

1001165161 is an equidigital number, since it uses as much as digits as its factorization.

1001165161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288662.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 1001165161 is about 31641.1940514261. The cubic root of 1001165161 is about 1000.3882362531.

Adding to 1001165161 its reverse (1615611001), we get a palindrome (2616776162).

The spelling of 1001165161 in words is "one billion, one million, one hundred sixty-five thousand, one hundred sixty-one".