1251561134212 has 12 divisors (see below), whose sum is σ = 2191931165340. Its totient is φ = 625295086976.

The previous prime is 1251561134209. The next prime is 1251561134251. The reversal of 1251561134212 is 2124311651521.

It can be written as a sum of positive squares in 2 ways, for example, as 881841196096 + 369719938116 = 939064^2 + 608046^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 121364233 + ... + 121374544.

It is an arithmetic number, because the mean of its divisors is an integer number (182660930445).

Almost surely, 2^{1251561134212} is an apocalyptic number.

It is an amenable number.

1251561134212 is a deficient number, since it is larger than the sum of its proper divisors (940370031128).

1251561134212 is a wasteful number, since it uses less digits than its factorization.

1251561134212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242740070 (or 242740068 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

Adding to 1251561134212 its reverse (2124311651521), we get a palindrome (3375872785733).

The spelling of 1251561134212 in words is "one trillion, two hundred fifty-one billion, five hundred sixty-one million, one hundred thirty-four thousand, two hundred twelve".