1211205150973 has 2 divisors, whose sum is σ = 1211205150974. Its totient is φ = 1211205150972.

The previous prime is 1211205150941. The next prime is 1211205150979. The reversal of 1211205150973 is 3790515021121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 714831357529 + 496373793444 = 845477^2 + 704538^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211205150973 - 2⁵ = 1211205150941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211205150979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605602575486 + 605602575487.

It is an arithmetic number, because the mean of its divisors is an integer number (605602575487).

Almost surely, 2^{1211205150973} is an apocalyptic number.

It is an amenable number.

1211205150973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211205150973 is an equidigital number, since it uses as much as digits as its factorization.

1211205150973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 37.

The spelling of 1211205150973 in words is "one trillion, two hundred eleven billion, two hundred five million, one hundred fifty thousand, nine hundred seventy-three".