1242123554 has 16 divisors (see below), whose sum is σ = 2129969088. Its totient is φ = 532185072.

The previous prime is 1242123551. The next prime is 1242123569. The reversal of 1242123554 is 4553212421.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1242123551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47129 + ... + 68595.

It is an arithmetic number, because the mean of its divisors is an integer number (133123068).

Almost surely, 2^1242123554 is an apocalyptic number.

1242123554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1242123554 is a deficient number, since it is larger than the sum of its proper divisors (887845534).

1242123554 is a wasteful number, since it uses less digits than its factorization.

1242123554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25609.

The product of its digits is 9600, while the sum is 29.

The square root of 1242123554 is about 35243.7732656423. The cubic root of 1242123554 is about 1074.9500042370.

Adding to 1242123554 its reverse (4553212421), we get a palindrome (5795335975).

The spelling of 1242123554 in words is "one billion, two hundred forty-two million, one hundred twenty-three thousand, five hundred fifty-four".