1212651609737 has 2 divisors, whose sum is σ = 1212651609738. Its totient is φ = 1212651609736.

The previous prime is 1212651609733. The next prime is 1212651609781. The reversal of 1212651609737 is 7379061562121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1173157599376 + 39494010361 = 1083124^2 + 198731^2 .

It is an emirp because it is prime and its reverse (7379061562121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212651609737 - 2² = 1212651609733 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212651609733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606325804868 + 606325804869.

It is an arithmetic number, because the mean of its divisors is an integer number (606325804869).

Almost surely, 2^{1212651609737} is an apocalyptic number.

It is an amenable number.

1212651609737 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212651609737 is an equidigital number, since it uses as much as digits as its factorization.

1212651609737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 50.

The spelling of 1212651609737 in words is "one trillion, two hundred twelve billion, six hundred fifty-one million, six hundred nine thousand, seven hundred thirty-seven".