1911842697749 has 2 divisors, whose sum is σ = 1911842697750. Its totient is φ = 1911842697748.

The previous prime is 1911842697707. The next prime is 1911842697757. The reversal of 1911842697749 is 9477962481191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1310551012849 + 601291684900 = 1144793^2 + 775430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1911842697749 - 2²⁰ = 1911841649173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971842697749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 955921348874 + 955921348875.

It is an arithmetic number, because the mean of its divisors is an integer number (955921348875).

Almost surely, 2^{1911842697749} is an apocalyptic number.

It is an amenable number.

1911842697749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1911842697749 is an equidigital number, since it uses as much as digits as its factorization.

1911842697749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 68.

The spelling of 1911842697749 in words is "one trillion, nine hundred eleven billion, eight hundred forty-two million, six hundred ninety-seven thousand, seven hundred forty-nine".