1242125111 has 4 divisors (see below), whose sum is σ = 1315191312. Its totient is φ = 1169058912.

The previous prime is 1242125107. The next prime is 1242125123. The reversal of 1242125111 is 1115212421.

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 1242125111 - 2² = 1242125107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242125141) 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, 36533075 + ... + 36533108.

It is an arithmetic number, because the mean of its divisors is an integer number (328797828).

Almost surely, 2^1242125111 is an apocalyptic number.

1242125111 is a deficient number, since it is larger than the sum of its proper divisors (73066201).

1242125111 is an equidigital number, since it uses as much as digits as its factorization.

1242125111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73066200.

The product of its digits is 160, while the sum is 20.

The square root of 1242125111 is about 35243.7953546436. The cubic root of 1242125111 is about 1074.9504533862.

Adding to 1242125111 its reverse (1115212421), we get a palindrome (2357337532).

The spelling of 1242125111 in words is "one billion, two hundred forty-two million, one hundred twenty-five thousand, one hundred eleven".