1005540101 has 4 divisors (see below), whose sum is σ = 1005873804. Its totient is φ = 1005206400.

The previous prime is 1005540061. The next prime is 1005540131. The reversal of 1005540101 is 1010455001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 998623201 + 6916900 = 31601^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005540101 - 2⁶ = 1005540037 is a prime.

It is a super-2 number, since 2×1005540101² = 2022221789438180402, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1005540101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005540131) 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, 162290 + ... + 168371.

It is an arithmetic number, because the mean of its divisors is an integer number (251468451).

Almost surely, 2^1005540101 is an apocalyptic number.

It is an amenable number.

1005540101 is a deficient number, since it is larger than the sum of its proper divisors (333703).

1005540101 is an equidigital number, since it uses as much as digits as its factorization.

1005540101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333702.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1005540101 is about 31710.2523011092. The cubic root of 1005540101 is about 1001.8433004889.

Adding to 1005540101 its reverse (1010455001), we get a palindrome (2015995102).

The spelling of 1005540101 in words is "one billion, five million, five hundred forty thousand, one hundred one".