1001125161 has 24 divisors (see below), whose sum is σ = 1460540640. Its totient is φ = 660773376.

The previous prime is 1001125141. The next prime is 1001125199. The reversal of 1001125161 is 1615211001.

It is a happy number.

It is not a de Polignac number, because 1001125161 - 2¹¹ = 1001123113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001125141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 393030 + ... + 395568.

It is an arithmetic number, because the mean of its divisors is an integer number (60855860).

Almost surely, 2^1001125161 is an apocalyptic number.

It is an amenable number.

1001125161 is a deficient number, since it is larger than the sum of its proper divisors (459415479).

1001125161 is a wasteful number, since it uses less digits than its factorization.

1001125161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965 (or 2962 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The square root of 1001125161 is about 31640.5619577150. The cubic root of 1001125161 is about 1000.3749130893.

Adding to 1001125161 its reverse (1615211001), we get a palindrome (2616336162).

The spelling of 1001125161 in words is "one billion, one million, one hundred twenty-five thousand, one hundred sixty-one".