1001161645 has 16 divisors (see below), whose sum is σ = 1311266880. Its totient is φ = 727753600.

The previous prime is 1001161633. The next prime is 1001161649. The reversal of 1001161645 is 5461611001.

It is not a de Polignac number, because 1001161645 - 2⁷ = 1001161517 is a prime.

It is a super-3 number, since 3×1001161645³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001161649) 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 in 15 ways as a sum of consecutive naturals, for example, 160230 + ... + 166360.

It is an arithmetic number, because the mean of its divisors is an integer number (81954180).

Almost surely, 2^1001161645 is an apocalyptic number.

It is an amenable number.

1001161645 is a deficient number, since it is larger than the sum of its proper divisors (310105235).

1001161645 is a wasteful number, since it uses less digits than its factorization.

1001161645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9116.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1001161645 is about 31641.1384908950. The cubic root of 1001161645 is about 1000.3870651612.

Adding to 1001161645 its reverse (5461611001), we get a palindrome (6462772646).

It can be divided in two parts, 100116 and 1645, that added together give a square (101761 = 319²).

The spelling of 1001161645 in words is "one billion, one million, one hundred sixty-one thousand, six hundred forty-five".