1212161975951 has 2 divisors, whose sum is σ = 1212161975952. Its totient is φ = 1212161975950.

The previous prime is 1212161975909. The next prime is 1212161976001. The reversal of 1212161975951 is 1595791612121.

It is a happy number.

It is an a-pointer prime, because the next prime (1212161976001) can be obtained adding 1212161975951 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212161975951 - 2³⁰ = 1211088234127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212161975951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212161972951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606080987975 + 606080987976.

It is an arithmetic number, because the mean of its divisors is an integer number (606080987976).

Almost surely, 2^{1212161975951} is an apocalyptic number.

1212161975951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212161975951 is an equidigital number, since it uses as much as digits as its factorization.

1212161975951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 50.

The spelling of 1212161975951 in words is "one trillion, two hundred twelve billion, one hundred sixty-one million, nine hundred seventy-five thousand, nine hundred fifty-one".