1242113131 has 4 divisors (see below), whose sum is σ = 1419557872. Its totient is φ = 1064668392.

The previous prime is 1242113113. The next prime is 1242113161. The reversal of 1242113131 is 1313112421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1313112421 = 367 ⋅3577963.

It is a cyclic number.

It is not a de Polignac number, because 1242113131 - 2⁵ = 1242113099 is a prime.

It is a super-3 number, since 3×1242113131³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242113099 and 1242113108.

It is not an unprimeable number, because it can be changed into a prime (1242113161) 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, 88722360 + ... + 88722373.

It is an arithmetic number, because the mean of its divisors is an integer number (354889468).

Almost surely, 2^1242113131 is an apocalyptic number.

1242113131 is a deficient number, since it is larger than the sum of its proper divisors (177444741).

1242113131 is an equidigital number, since it uses as much as digits as its factorization.

1242113131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177444740.

The product of its digits is 144, while the sum is 19.

The square root of 1242113131 is about 35243.6253952399. The cubic root of 1242113131 is about 1074.9469974949.

Adding to 1242113131 its reverse (1313112421), we get a palindrome (2555225552).

It can be divided in two parts, 12421 and 13131, that added together give a palindrome (25552).

The spelling of 1242113131 in words is "one billion, two hundred forty-two million, one hundred thirteen thousand, one hundred thirty-one".