1251431423252 has 6 divisors (see below), whose sum is σ = 2190004990698. Its totient is φ = 625715711624.

The previous prime is 1251431423219. The next prime is 1251431423299. The reversal of 1251431423252 is 2523241341521.

It can be written as a sum of positive squares in only one way, i.e., 1047765148816 + 203666274436 = 1023604^2 + 451294^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 156428927903 + ... + 156428927910.

It is an arithmetic number, because the mean of its divisors is an integer number (365000831783).

Almost surely, 2^{1251431423252} is an apocalyptic number.

It is an amenable number.

1251431423252 is a deficient number, since it is larger than the sum of its proper divisors (938573567446).

1251431423252 is a wasteful number, since it uses less digits than its factorization.

1251431423252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312857855817 (or 312857855815 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

Adding to 1251431423252 its reverse (2523241341521), we get a palindrome (3774672764773).

The spelling of 1251431423252 in words is "one trillion, two hundred fifty-one billion, four hundred thirty-one million, four hundred twenty-three thousand, two hundred fifty-two".