1218219530387 has 4 divisors (see below), whose sum is σ = 1218225018120. Its totient is φ = 1218214042656.

The previous prime is 1218219530347. The next prime is 1218219530399. The reversal of 1218219530387 is 7830359128121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1218219530387 - 2⁸ = 1218219530131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218219530317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2396198 + ... + 2859755.

It is an arithmetic number, because the mean of its divisors is an integer number (304556254530).

Almost surely, 2^{1218219530387} is an apocalyptic number.

1218219530387 is a deficient number, since it is larger than the sum of its proper divisors (5487733).

1218219530387 is an equidigital number, since it uses as much as digits as its factorization.

1218219530387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5487732.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 1218219530387 in words is "one trillion, two hundred eighteen billion, two hundred nineteen million, five hundred thirty thousand, three hundred eighty-seven".