1218184531201 has 4 divisors (see below), whose sum is σ = 1328928579504. Its totient is φ = 1107440482900.

The previous prime is 1218184531199. The next prime is 1218184531247. The reversal of 1218184531201 is 1021354818121.

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 cyclic number.

It is not a de Polignac number, because 1218184531201 - 2¹ = 1218184531199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218184331201) 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, 55372024135 + ... + 55372024156.

It is an arithmetic number, because the mean of its divisors is an integer number (332232144876).

Almost surely, 2^{1218184531201} is an apocalyptic number.

1218184531201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1218184531201 is a deficient number, since it is larger than the sum of its proper divisors (110744048303).

1218184531201 is a wasteful number, since it uses less digits than its factorization.

1218184531201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110744048302.

The product of its (nonzero) digits is 15360, while the sum is 37.

It can be divided in two parts, 1218184 and 531201, that added together give a triangular number (1749385 = T₁₈₇₀).

The spelling of 1218184531201 in words is "one trillion, two hundred eighteen billion, one hundred eighty-four million, five hundred thirty-one thousand, two hundred one".