1242123833 has 2 divisors, whose sum is σ = 1242123834. Its totient is φ = 1242123832.

The previous prime is 1242123829. The next prime is 1242123859. The reversal of 1242123833 is 3383212421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 862185769 + 379938064 = 29363^2 + 19492^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242123833 - 2² = 1242123829 is a prime.

It is a super-2 number, since 2×1242123833² = 3085743233013223778, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1242123796 and 1242123805.

It is not a weakly prime, because it can be changed into another prime (1242123863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621061916 + 621061917.

It is an arithmetic number, because the mean of its divisors is an integer number (621061917).

Almost surely, 2^1242123833 is an apocalyptic number.

It is an amenable number.

1242123833 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242123833 is an equidigital number, since it uses as much as digits as its factorization.

1242123833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 1242123833 is about 35243.7772237880. Note that the first 3 decimals coincide. The cubic root of 1242123833 is about 1074.9500847204.

The spelling of 1242123833 in words is "one billion, two hundred forty-two million, one hundred twenty-three thousand, eight hundred thirty-three".