1201999937869 has 2 divisors, whose sum is σ = 1201999937870. Its totient is φ = 1201999937868.

The previous prime is 1201999937843. The next prime is 1201999937891. The reversal of 1201999937869 is 9687399991021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1114318805769 + 87681132100 = 1055613^2 + 296110^2 .

It is an emirp because it is prime and its reverse (9687399991021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201999937869 - 2¹⁹ = 1201999413581 is a prime.

It is a super-2 number, since 2×1201999937869² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201999937899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600999968934 + 600999968935.

It is an arithmetic number, because the mean of its divisors is an integer number (600999968935).

Almost surely, 2^{1201999937869} is an apocalyptic number.

It is an amenable number.

1201999937869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201999937869 is an equidigital number, since it uses as much as digits as its factorization.

1201999937869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119042784, while the sum is 73.

The spelling of 1201999937869 in words is "one trillion, two hundred one billion, nine hundred ninety-nine million, nine hundred thirty-seven thousand, eight hundred sixty-nine".