1251453706681 has 2 divisors, whose sum is σ = 1251453706682. Its totient is φ = 1251453706680.

The previous prime is 1251453706673. The next prime is 1251453706729. The reversal of 1251453706681 is 1866073541521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 993779703225 + 257674003456 = 996885^2 + 507616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251453706681 - 2³ = 1251453706673 is a prime.

It is a super-2 number, since 2×1251453706681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1251453706651) 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 as a sum of consecutive naturals, namely, 625726853340 + 625726853341.

It is an arithmetic number, because the mean of its divisors is an integer number (625726853341).

Almost surely, 2^{1251453706681} is an apocalyptic number.

It is an amenable number.

1251453706681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251453706681 is an equidigital number, since it uses as much as digits as its factorization.

1251453706681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 1251453706681 in words is "one trillion, two hundred fifty-one billion, four hundred fifty-three million, seven hundred six thousand, six hundred eighty-one".