1243243455001 has 4 divisors (see below), whose sum is σ = 1243736612404. Its totient is φ = 1242750297600.

The previous prime is 1243243454993. The next prime is 1243243455017. The reversal of 1243243455001 is 1005543423421.

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 22105742400 + 1221137712601 = 148680^2 + 1105051^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243243455001 - 2³ = 1243243454993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243243455061) 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, 246574920 + ... + 246579961.

It is an arithmetic number, because the mean of its divisors is an integer number (310934153101).

Almost surely, 2^{1243243455001} is an apocalyptic number.

It is an amenable number.

1243243455001 is a deficient number, since it is larger than the sum of its proper divisors (493157403).

1243243455001 is an equidigital number, since it uses as much as digits as its factorization.

1243243455001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493157402.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 1243243455001 its reverse (1005543423421), we get a palindrome (2248786878422).

The spelling of 1243243455001 in words is "one trillion, two hundred forty-three billion, two hundred forty-three million, four hundred fifty-five thousand, one".