1201999879049 has 2 divisors, whose sum is σ = 1201999879050. Its totient is φ = 1201999879048.

The previous prime is 1201999879033. The next prime is 1201999879099. The reversal of 1201999879049 is 9409789991021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 839165923600 + 362833955449 = 916060^2 + 602357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201999879049 - 2⁴ = 1201999879033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201999879049.

It is not a weakly prime, because it can be changed into another prime (1201999879019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600999939524 + 600999939525.

It is an arithmetic number, because the mean of its divisors is an integer number (600999939525).

Almost surely, 2^{1201999879049} is an apocalyptic number.

It is an amenable number.

1201999879049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201999879049 is an equidigital number, since it uses as much as digits as its factorization.

1201999879049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26453952, while the sum is 68.

The spelling of 1201999879049 in words is "one trillion, two hundred one billion, nine hundred ninety-nine million, eight hundred seventy-nine thousand, forty-nine".