1243425451 has 4 divisors (see below), whose sum is σ = 1251053992. Its totient is φ = 1235796912.

The previous prime is 1243425437. The next prime is 1243425479. The reversal of 1243425451 is 1545243421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1545243421 = 34367 ⋅44963.

It is a cyclic number.

It is not a de Polignac number, because 1243425451 - 2¹⁷ = 1243294379 is a prime.

It is a super-2 number, since 2×1243425451² = 3092213704389106802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243425481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3814026 + ... + 3814351.

It is an arithmetic number, because the mean of its divisors is an integer number (312763498).

Almost surely, 2^1243425451 is an apocalyptic number.

1243425451 is a deficient number, since it is larger than the sum of its proper divisors (7628541).

1243425451 is an equidigital number, since it uses as much as digits as its factorization.

1243425451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7628540.

The product of its digits is 19200, while the sum is 31.

The square root of 1243425451 is about 35262.2383152289. The cubic root of 1243425451 is about 1075.3254326785.

Adding to 1243425451 its reverse (1545243421), we get a palindrome (2788668872).

The spelling of 1243425451 in words is "one billion, two hundred forty-three million, four hundred twenty-five thousand, four hundred fifty-one".