1101001040 has 20 divisors (see below), whose sum is σ = 2559827604. Its totient is φ = 440400384.

The previous prime is 1101001021. The next prime is 1101001049. The reversal of 1101001040 is 401001011.

It can be written as a sum of positive squares in 2 ways, for example, as 310041664 + 790959376 = 17608^2 + 28124^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101001049) 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, 6881177 + ... + 6881336.

Almost surely, 2^1101001040 is an apocalyptic number.

1101001040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101001040 is an abundant number, since it is smaller than the sum of its proper divisors (1458826564).

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

1101001040 is a wasteful number, since it uses less digits than its factorization.

1101001040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13762526 (or 13762520 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1101001040 is about 33181.3357175386. The cubic root of 1101001040 is about 1032.5931579964.

Adding to 1101001040 its reverse (401001011), we get a palindrome (1502002051).

The spelling of 1101001040 in words is "one billion, one hundred one million, one thousand, forty".