1242351555 has 16 divisors (see below), whose sum is σ = 2074187520. Its totient is φ = 633779168.

The previous prime is 1242351547. The next prime is 1242351569. The reversal of 1242351555 is 5551532421.

It is not a de Polignac number, because 1242351555 - 2³ = 1242351547 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1800165 + ... + 1800854.

It is an arithmetic number, because the mean of its divisors is an integer number (129636720).

Almost surely, 2^1242351555 is an apocalyptic number.

1242351555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1242351555 is a deficient number, since it is larger than the sum of its proper divisors (831835965).

1242351555 is a wasteful number, since it uses less digits than its factorization.

1242351555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601050.

The product of its digits is 30000, while the sum is 33.

The square root of 1242351555 is about 35247.0077453392. The cubic root of 1242351555 is about 1075.0157718977.

Adding to 1242351555 its reverse (5551532421), we get a palindrome (6793883976).

The spelling of 1242351555 in words is "one billion, two hundred forty-two million, three hundred fifty-one thousand, five hundred fifty-five".