1242205355 has 4 divisors (see below), whose sum is σ = 1490646432. Its totient is φ = 993764280.

The previous prime is 1242205337. The next prime is 1242205379. The reversal of 1242205355 is 5535022421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5535022421 = 3407 ⋅1624603.

It is not a de Polignac number, because 1242205355 - 2⁸ = 1242205099 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 124220531 + ... + 124220540.

It is an arithmetic number, because the mean of its divisors is an integer number (372661608).

Almost surely, 2^1242205355 is an apocalyptic number.

1242205355 is a deficient number, since it is larger than the sum of its proper divisors (248441077).

1242205355 is an equidigital number, since it uses as much as digits as its factorization.

1242205355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248441076.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 1242205355 is about 35244.9337494057. The cubic root of 1242205355 is about 1074.9736009382.

Adding to 1242205355 its reverse (5535022421), we get a palindrome (6777227776).

The spelling of 1242205355 in words is "one billion, two hundred forty-two million, two hundred five thousand, three hundred fifty-five".