1251303520323 has 16 divisors (see below), whose sum is σ = 1756239668480. Its totient is φ = 790286069664.

The previous prime is 1251303520273. The next prime is 1251303520333. The reversal of 1251303520323 is 3230253031521.

It is a happy number.

It is not a de Polignac number, because 1251303520323 - 2⁸ = 1251303520067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251303520333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6796065 + ... + 6977757.

It is an arithmetic number, because the mean of its divisors is an integer number (109764979280).

Almost surely, 2^{1251303520323} is an apocalyptic number.

1251303520323 is a deficient number, since it is larger than the sum of its proper divisors (504936148157).

1251303520323 is a wasteful number, since it uses less digits than its factorization.

1251303520323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302538.

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 1251303520323 its reverse (3230253031521), we get a palindrome (4481556551844).

The spelling of 1251303520323 in words is "one trillion, two hundred fifty-one billion, three hundred three million, five hundred twenty thousand, three hundred twenty-three".