1218382601 has 4 divisors (see below), whose sum is σ = 1221158400. Its totient is φ = 1215606804.

The previous prime is 1218382591. The next prime is 1218382631. The reversal of 1218382601 is 1062838121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-1218382601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218382631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387241 + ... + 1388118.

It is an arithmetic number, because the mean of its divisors is an integer number (305289600).

Almost surely, 2^1218382601 is an apocalyptic number.

It is an amenable number.

1218382601 is a deficient number, since it is larger than the sum of its proper divisors (2775799).

1218382601 is an equidigital number, since it uses as much as digits as its factorization.

1218382601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775798.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1218382601 is about 34905.3377150258. The cubic root of 1218382601 is about 1068.0573249002.

The spelling of 1218382601 in words is "one billion, two hundred eighteen million, three hundred eighty-two thousand, six hundred one".