1243142203409 has 6 divisors (see below), whose sum is σ = 1249616766006. Its totient is φ = 1236701015040.

The previous prime is 1243142203367. The next prime is 1243142203417. The reversal of 1243142203409 is 9043022413421.

It can be written as a sum of positive squares in 3 ways, for example, as 24469719184 + 1218672484225 = 156428^2 + 1103935^2 .

It is not a de Polignac number, because 1243142203409 - 2⁸ = 1243142203153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243142203489) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16649672 + ... + 16724169.

It is an arithmetic number, because the mean of its divisors is an integer number (208269461001).

Almost surely, 2^{1243142203409} is an apocalyptic number.

It is an amenable number.

1243142203409 is a deficient number, since it is larger than the sum of its proper divisors (6474562597).

1243142203409 is an frugal number, since it uses more digits than its factorization.

1243142203409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33374227 (or 33374034 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 1243142203409 in words is "one trillion, two hundred forty-three billion, one hundred forty-two million, two hundred three thousand, four hundred nine".