1815118153 has 4 divisors (see below), whose sum is σ = 1815445008. Its totient is φ = 1814791300.

The previous prime is 1815118103. The next prime is 1815118177. The reversal of 1815118153 is 3518115181.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-1815118153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1815118103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154951 + ... + 166252.

It is an arithmetic number, because the mean of its divisors is an integer number (453861252).

Almost surely, 2^1815118153 is an apocalyptic number.

It is an amenable number.

1815118153 is a deficient number, since it is larger than the sum of its proper divisors (326855).

1815118153 is an equidigital number, since it uses as much as digits as its factorization.

1815118153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326854.

The product of its digits is 4800, while the sum is 34.

The square root of 1815118153 is about 42604.2034663248. The cubic root of 1815118153 is about 1219.8365258432.

It can be divided in two parts, 181511815 and 3, that multiplied together give a palindrome (544535445).

The spelling of 1815118153 in words is "one billion, eight hundred fifteen million, one hundred eighteen thousand, one hundred fifty-three".