1243134307 has 4 divisors (see below), whose sum is σ = 1264204440. Its totient is φ = 1222064176.

The previous prime is 1243134253. The next prime is 1243134313. The reversal of 1243134307 is 7034313421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243134307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243132307) 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, 10534978 + ... + 10535095.

It is an arithmetic number, because the mean of its divisors is an integer number (316051110).

Almost surely, 2^1243134307 is an apocalyptic number.

1243134307 is a deficient number, since it is larger than the sum of its proper divisors (21070133).

1243134307 is an equidigital number, since it uses as much as digits as its factorization.

1243134307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21070132.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 1243134307 is about 35258.1098046960. The cubic root of 1243134307 is about 1075.2414981502.

Adding to 1243134307 its reverse (7034313421), we get a palindrome (8277447728).

The spelling of 1243134307 in words is "one billion, two hundred forty-three million, one hundred thirty-four thousand, three hundred seven".