1242131111 has 16 divisors (see below), whose sum is σ = 1347746400. Its totient is φ = 1137991680.

The previous prime is 1242131089. The next prime is 1242131147. The reversal of 1242131111 is 1111312421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242131111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1242131111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242131171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1406276 + ... + 1407158.

It is an arithmetic number, because the mean of its divisors is an integer number (84234150).

Almost surely, 2^1242131111 is an apocalyptic number.

1242131111 is a deficient number, since it is larger than the sum of its proper divisors (105615289).

1242131111 is a wasteful number, since it uses less digits than its factorization.

1242131111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586.

The product of its digits is 48, while the sum is 17.

The square root of 1242131111 is about 35243.8804759067. The cubic root of 1242131111 is about 1074.9521842082.

Adding to 1242131111 its reverse (1111312421), we get a palindrome (2353443532).

The spelling of 1242131111 in words is "one billion, two hundred forty-two million, one hundred thirty-one thousand, one hundred eleven".