1240131013243 has 4 divisors (see below), whose sum is σ = 1243223609688. Its totient is φ = 1237038416800.

The previous prime is 1240131013189. The next prime is 1240131013267. The reversal of 1240131013243 is 3423101310421.

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

It is a cyclic number.

It is not a de Polignac number, because 1240131013243 - 2³⁷ = 1102692059771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240131013283) 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, 1546297621 + ... + 1546298422.

It is an arithmetic number, because the mean of its divisors is an integer number (310805902422).

Almost surely, 2^{1240131013243} is an apocalyptic number.

1240131013243 is a deficient number, since it is larger than the sum of its proper divisors (3092596445).

1240131013243 is an equidigital number, since it uses as much as digits as its factorization.

1240131013243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092596444.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 1240131013243 its reverse (3423101310421), we get a palindrome (4663232323664).

The spelling of 1240131013243 in words is "one trillion, two hundred forty billion, one hundred thirty-one million, thirteen thousand, two hundred forty-three".