1249744321 has 4 divisors (see below), whose sum is σ = 1428279232. Its totient is φ = 1071209412.

The previous prime is 1249744297. The next prime is 1249744351. The reversal of 1249744321 is 1234479421.

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 not a de Polignac number, because 1249744321 - 2¹⁵ = 1249711553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249744351) 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, 89267445 + ... + 89267458.

It is an arithmetic number, because the mean of its divisors is an integer number (357069808).

Almost surely, 2^1249744321 is an apocalyptic number.

It is an amenable number.

1249744321 is a deficient number, since it is larger than the sum of its proper divisors (178534911).

1249744321 is an equidigital number, since it uses as much as digits as its factorization.

1249744321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178534910.

The product of its digits is 48384, while the sum is 37.

The square root of 1249744321 is about 35351.7230273151. The cubic root of 1249744321 is about 1077.1438941801.

It can be divided in two parts, 1249 and 744321, that multiplied together give a palindrome (929656929).

The spelling of 1249744321 in words is "one billion, two hundred forty-nine million, seven hundred forty-four thousand, three hundred twenty-one".