1252443213451 has 4 divisors (see below), whose sum is σ = 1326116343672. Its totient is φ = 1178770083232.

The previous prime is 1252443213443. The next prime is 1252443213479. The reversal of 1252443213451 is 1543123442521.

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 1252443213451 - 2³ = 1252443213443 is a prime.

It is a super-2 number, since 2×1252443213451² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1252443213451.

It is not an unprimeable number, because it can be changed into a prime (1252443217451) 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, 36836565085 + ... + 36836565118.

It is an arithmetic number, because the mean of its divisors is an integer number (331529085918).

Almost surely, 2^{1252443213451} is an apocalyptic number.

1252443213451 is a deficient number, since it is larger than the sum of its proper divisors (73673130221).

1252443213451 is an equidigital number, since it uses as much as digits as its factorization.

1252443213451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73673130220.

The product of its digits is 115200, while the sum is 37.

Adding to 1252443213451 its reverse (1543123442521), we get a palindrome (2795566655972).

The spelling of 1252443213451 in words is "one trillion, two hundred fifty-two billion, four hundred forty-three million, two hundred thirteen thousand, four hundred fifty-one".