1251533453551 has 2 divisors, whose sum is σ = 1251533453552. Its totient is φ = 1251533453550.

The previous prime is 1251533453509. The next prime is 1251533453617. The reversal of 1251533453551 is 1553543351521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251533453551 - 2⁹ = 1251533453039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1251533453498 and 1251533453507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251533453251) 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 as a sum of consecutive naturals, namely, 625766726775 + 625766726776.

It is an arithmetic number, because the mean of its divisors is an integer number (625766726776).

Almost surely, 2^{1251533453551} is an apocalyptic number.

1251533453551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251533453551 is an equidigital number, since it uses as much as digits as its factorization.

1251533453551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 675000, while the sum is 43.

The spelling of 1251533453551 in words is "one trillion, two hundred fifty-one billion, five hundred thirty-three million, four hundred fifty-three thousand, five hundred fifty-one".