1243238249 has 4 divisors (see below), whose sum is σ = 1356259920. Its totient is φ = 1130216580.

The previous prime is 1243238201. The next prime is 1243238261. The reversal of 1243238249 is 9428323421.

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 a de Polignac number, because none of the positive numbers 2^k-1243238249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243238749) 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, 56510819 + ... + 56510840.

It is an arithmetic number, because the mean of its divisors is an integer number (339064980).

Almost surely, 2^1243238249 is an apocalyptic number.

It is an amenable number.

1243238249 is a deficient number, since it is larger than the sum of its proper divisors (113021671).

1243238249 is a wasteful number, since it uses less digits than its factorization.

1243238249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113021670.

The product of its digits is 82944, while the sum is 38.

The square root of 1243238249 is about 35259.5837893756. The cubic root of 1243238249 is about 1075.2714653164.

The spelling of 1243238249 in words is "one billion, two hundred forty-three million, two hundred thirty-eight thousand, two hundred forty-nine".