1212691355977 has 2 divisors, whose sum is σ = 1212691355978. Its totient is φ = 1212691355976.

The previous prime is 1212691355971. The next prime is 1212691356047. The reversal of 1212691355977 is 7795531962121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1050428209216 + 162263146761 = 1024904^2 + 402819^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212691355977 - 2³⁵ = 1178331617609 is a prime.

It is a super-2 number, since 2×1212691355977² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1212691355971) 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, 606345677988 + 606345677989.

It is an arithmetic number, because the mean of its divisors is an integer number (606345677989).

Almost surely, 2^{1212691355977} is an apocalyptic number.

It is an amenable number.

1212691355977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212691355977 is an equidigital number, since it uses as much as digits as its factorization.

1212691355977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7144200, while the sum is 58.

The spelling of 1212691355977 in words is "one trillion, two hundred twelve billion, six hundred ninety-one million, three hundred fifty-five thousand, nine hundred seventy-seven".