1200515051261 has 2 divisors, whose sum is σ = 1200515051262. Its totient is φ = 1200515051260.

The previous prime is 1200515051227. The next prime is 1200515051279. The reversal of 1200515051261 is 1621505150021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 985502925625 + 215012125636 = 992725^2 + 463694^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200515051261 - 2¹⁴ = 1200515034877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200515051291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600257525630 + 600257525631.

It is an arithmetic number, because the mean of its divisors is an integer number (600257525631).

Almost surely, 2^{1200515051261} is an apocalyptic number.

It is an amenable number.

1200515051261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200515051261 is an equidigital number, since it uses as much as digits as its factorization.

1200515051261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 1200515051261 in words is "one trillion, two hundred billion, five hundred fifteen million, fifty-one thousand, two hundred sixty-one".