1218152365 has 4 divisors (see below), whose sum is σ = 1461782844. Its totient is φ = 974521888.

The previous prime is 1218152311. The next prime is 1218152407. The reversal of 1218152365 is 5632518121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5632518121 = 229 ⋅24596149.

It can be written as a sum of positive squares in 2 ways, for example, as 420824196 + 797328169 = 20514^2 + 28237^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218152365 - 2¹⁵ = 1218119597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218152365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121815232 + ... + 121815241.

It is an arithmetic number, because the mean of its divisors is an integer number (365445711).

Almost surely, 2^1218152365 is an apocalyptic number.

It is an amenable number.

1218152365 is a deficient number, since it is larger than the sum of its proper divisors (243630479).

1218152365 is an equidigital number, since it uses as much as digits as its factorization.

1218152365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243630478.

The product of its digits is 14400, while the sum is 34.

The square root of 1218152365 is about 34902.0395535848. The cubic root of 1218152365 is about 1067.9900442455.

It can be divided in two parts, 12181 and 52365, that added together give a palindrome (64546).

The spelling of 1218152365 in words is "one billion, two hundred eighteen million, one hundred fifty-two thousand, three hundred sixty-five".