1243200013 has 4 divisors (see below), whose sum is σ = 1356218208. Its totient is φ = 1130181820.

The previous prime is 1243199983. The next prime is 1243200017. The reversal of 1243200013 is 3100023421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243200013 - 2⁵ = 1243199981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243200013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243200017) 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, 56509081 + ... + 56509102.

It is an arithmetic number, because the mean of its divisors is an integer number (339054552).

Almost surely, 2^1243200013 is an apocalyptic number.

It is an amenable number.

1243200013 is a deficient number, since it is larger than the sum of its proper divisors (113018195).

1243200013 is a wasteful number, since it uses less digits than its factorization.

1243200013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113018194.

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

The square root of 1243200013 is about 35259.0415780123. The cubic root of 1243200013 is about 1075.2604418189.

Adding to 1243200013 its reverse (3100023421), we get a palindrome (4343223434).

The spelling of 1243200013 in words is "one billion, two hundred forty-three million, two hundred thousand, thirteen".