1251442852161 has 16 divisors (see below), whose sum is σ = 1704349810944. Its totient is φ = 816420927104.

The previous prime is 1251442852159. The next prime is 1251442852169. The reversal of 1251442852161 is 1612582441521.

It is a cyclic number.

It is not a de Polignac number, because 1251442852161 - 2¹ = 1251442852159 is a prime.

It is a super-2 number, since 2×1251442852161² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1251442852169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271045 + ... + 1605101.

It is an arithmetic number, because the mean of its divisors is an integer number (106521863184).

Almost surely, 2^{1251442852161} is an apocalyptic number.

It is an amenable number.

1251442852161 is a deficient number, since it is larger than the sum of its proper divisors (452906958783).

1251442852161 is a wasteful number, since it uses less digits than its factorization.

1251442852161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340760.

The product of its digits is 153600, while the sum is 42.

The spelling of 1251442852161 in words is "one trillion, two hundred fifty-one billion, four hundred forty-two million, eight hundred fifty-two thousand, one hundred sixty-one".