1243422101 has 4 divisors (see below), whose sum is σ = 1243821612. Its totient is φ = 1243022592.

The previous prime is 1243422097. The next prime is 1243422107. The reversal of 1243422101 is 1012243421.

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 888099601 + 355322500 = 29801^2 + 18850^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243422101 - 2² = 1243422097 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 (1243422107) 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, 195050 + ... + 201323.

It is an arithmetic number, because the mean of its divisors is an integer number (310955403).

Almost surely, 2^1243422101 is an apocalyptic number.

It is an amenable number.

1243422101 is a deficient number, since it is larger than the sum of its proper divisors (399511).

1243422101 is an equidigital number, since it uses as much as digits as its factorization.

1243422101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399510.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1243422101 is about 35262.1908139582. The cubic root of 1243422101 is about 1075.3244669743.

Adding to 1243422101 its reverse (1012243421), we get a palindrome (2255665522).

The spelling of 1243422101 in words is "one billion, two hundred forty-three million, four hundred twenty-two thousand, one hundred one".