1243320001 has 8 divisors (see below), whose sum is σ = 1550113344. Its totient is φ = 968820720.

The previous prime is 1243319989. The next prime is 1243320011. The reversal of 1243320001 is 1000233421.

It is a happy number.

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

It is not a de Polignac number, because 1243320001 - 2¹⁷ = 1243188929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243320011) 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, 8073430 + ... + 8073583.

It is an arithmetic number, because the mean of its divisors is an integer number (193764168).

Almost surely, 2^1243320001 is an apocalyptic number.

1243320001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1243320001 is a deficient number, since it is larger than the sum of its proper divisors (306793343).

1243320001 is a wasteful number, since it uses less digits than its factorization.

1243320001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16147031.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1243320001 is about 35260.7430579675. The cubic root of 1243320001 is about 1075.2950337853.

Adding to 1243320001 its reverse (1000233421), we get a palindrome (2243553422).

The spelling of 1243320001 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, one".