1234242145 has 4 divisors (see below), whose sum is σ = 1481090580. Its totient is φ = 987393712.

The previous prime is 1234242131. The next prime is 1234242157. The reversal of 1234242145 is 5412424321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5412424321 = 109 ⋅49655269.

It can be written as a sum of positive squares in 2 ways, for example, as 581388544 + 652853601 = 24112^2 + 25551^2 .

It is a cyclic number.

It is not a de Polignac number, because 1234242145 - 2¹⁹ = 1233717857 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 123424210 + ... + 123424219.

It is an arithmetic number, because the mean of its divisors is an integer number (370272645).

Almost surely, 2^1234242145 is an apocalyptic number.

It is an amenable number.

1234242145 is a deficient number, since it is larger than the sum of its proper divisors (246848435).

1234242145 is an equidigital number, since it uses as much as digits as its factorization.

1234242145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246848434.

The product of its digits is 7680, while the sum is 28.

The square root of 1234242145 is about 35131.7825480006. The cubic root of 1234242145 is about 1072.6716203391.

Adding to 1234242145 its reverse (5412424321), we get a palindrome (6646666466).

The spelling of 1234242145 in words is "one billion, two hundred thirty-four million, two hundred forty-two thousand, one hundred forty-five".