1220312331947 has 2 divisors, whose sum is σ = 1220312331948. Its totient is φ = 1220312331946.

The previous prime is 1220312331937. The next prime is 1220312332027. The reversal of 1220312331947 is 7491332130221.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (7491332130221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220312331947 - 2⁶ = 1220312331883 is a prime.

It is a super-3 number, since 3×1220312331947³ (a number of 37 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220312331947.

It is not a weakly prime, because it can be changed into another prime (1220312331937) 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, 610156165973 + 610156165974.

It is an arithmetic number, because the mean of its divisors is an integer number (610156165974).

Almost surely, 2^{1220312331947} is an apocalyptic number.

1220312331947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220312331947 is an equidigital number, since it uses as much as digits as its factorization.

1220312331947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The spelling of 1220312331947 in words is "one trillion, two hundred twenty billion, three hundred twelve million, three hundred thirty-one thousand, nine hundred forty-seven".