1243540101 has 8 divisors (see below), whose sum is σ = 1745319520. Its totient is φ = 785393712.

The previous prime is 1243540087. The next prime is 1243540153. The reversal of 1243540101 is 1010453421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243540101 - 2⁵ = 1243540069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243540601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10908190 + ... + 10908303.

It is an arithmetic number, because the mean of its divisors is an integer number (218164940).

Almost surely, 2^1243540101 is an apocalyptic number.

It is an amenable number.

1243540101 is a deficient number, since it is larger than the sum of its proper divisors (501779419).

1243540101 is a wasteful number, since it uses less digits than its factorization.

1243540101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21816515.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1243540101 is about 35263.8639544790. The cubic root of 1243540101 is about 1075.3584817773.

Adding to 1243540101 its reverse (1010453421), we get a palindrome (2253993522).

The spelling of 1243540101 in words is "one billion, two hundred forty-three million, five hundred forty thousand, one hundred one".