1218192903749 has 2 divisors, whose sum is σ = 1218192903750. Its totient is φ = 1218192903748.

The previous prime is 1218192903637. The next prime is 1218192903761. The reversal of 1218192903749 is 9473092918121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 921475204225 + 296717699524 = 959935^2 + 544718^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218192903749 - 2⁸ = 1218192903493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218192903694 and 1218192903703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218192903049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609096451874 + 609096451875.

It is an arithmetic number, because the mean of its divisors is an integer number (609096451875).

Almost surely, 2^{1218192903749} is an apocalyptic number.

It is an amenable number.

1218192903749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218192903749 is an equidigital number, since it uses as much as digits as its factorization.

1218192903749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 1218192903749 in words is "one trillion, two hundred eighteen billion, one hundred ninety-two million, nine hundred three thousand, seven hundred forty-nine".