1243253099 has 24 divisors (see below), whose sum is σ = 1401415680. Its totient is φ = 1101774960.

The previous prime is 1243253069. The next prime is 1243253101. The reversal of 1243253099 is 9903523421.

It is a happy number.

It is not a de Polignac number, because 1243253099 - 2¹⁶ = 1243187563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243253059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 792614 + ... + 794180.

It is an arithmetic number, because the mean of its divisors is an integer number (58392320).

Almost surely, 2^1243253099 is an apocalyptic number.

1243253099 is a deficient number, since it is larger than the sum of its proper divisors (158162581).

1243253099 is a wasteful number, since it uses less digits than its factorization.

1243253099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751 (or 1740 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 1243253099 is about 35259.7943697918. The cubic root of 1243253099 is about 1075.2757465332.

The spelling of 1243253099 in words is "one billion, two hundred forty-three million, two hundred fifty-three thousand, ninety-nine".