1240513243 has 4 divisors (see below), whose sum is σ = 1240593840. Its totient is φ = 1240432648.

The previous prime is 1240513133. The next prime is 1240513259. The reversal of 1240513243 is 3423150421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3423150421 = 23 ⋅148832627.

It is a cyclic number.

It is not a de Polignac number, because 1240513243 - 2⁹ = 1240512731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240513843) 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, 9223 + ... + 50656.

It is an arithmetic number, because the mean of its divisors is an integer number (310148460).

Almost surely, 2^1240513243 is an apocalyptic number.

1240513243 is a deficient number, since it is larger than the sum of its proper divisors (80597).

1240513243 is an equidigital number, since it uses as much as digits as its factorization.

1240513243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80596.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1240513243 is about 35220.9205302758. The cubic root of 1240513243 is about 1074.4852752695.

Adding to 1240513243 its reverse (3423150421), we get a palindrome (4663663664).

The spelling of 1240513243 in words is "one billion, two hundred forty million, five hundred thirteen thousand, two hundred forty-three".