1001161540 has 24 divisors (see below), whose sum is σ = 2159263512. Its totient is φ = 389640960.

The previous prime is 1001161531. The next prime is 1001161571. The reversal of 1001161540 is 451611001.

It can be written as a sum of positive squares in 4 ways, for example, as 107868996 + 893292544 = 10386^2 + 29888^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675721 + ... + 677200.

It is an arithmetic number, because the mean of its divisors is an integer number (89969313).

Almost surely, 2^1001161540 is an apocalyptic number.

1001161540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001161540 is an abundant number, since it is smaller than the sum of its proper divisors (1158101972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001161540 is a wasteful number, since it uses less digits than its factorization.

1001161540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352967 (or 1352965 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1001161540 is about 31641.1368316627. The cubic root of 1001161540 is about 1000.3870301883.

Adding to 1001161540 its reverse (451611001), we get a palindrome (1452772541).

The spelling of 1001161540 in words is "one billion, one million, one hundred sixty-one thousand, five hundred forty".