1234042043251 has 4 divisors (see below), whose sum is σ = 1234047658312. Its totient is φ = 1234036428192.

The previous prime is 1234042043243. The next prime is 1234042043287. The reversal of 1234042043251 is 1523402404321.

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 1234042043251 - 2³ = 1234042043243 is a prime.

It is a super-2 number, since 2×1234042043251² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1234042043231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2463846 + ... + 2922091.

It is an arithmetic number, because the mean of its divisors is an integer number (308511914578).

Almost surely, 2^{1234042043251} is an apocalyptic number.

1234042043251 is a deficient number, since it is larger than the sum of its proper divisors (5615061).

1234042043251 is an equidigital number, since it uses as much as digits as its factorization.

1234042043251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615060.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 1234042043251 its reverse (1523402404321), we get a palindrome (2757444447572).

The spelling of 1234042043251 in words is "one trillion, two hundred thirty-four billion, forty-two million, forty-three thousand, two hundred fifty-one".