1218147659 has 4 divisors (see below), whose sum is σ = 1219403160. Its totient is φ = 1216892160.

The previous prime is 1218147649. The next prime is 1218147691. The reversal of 1218147659 is 9567418121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218147659 is a prime.

It is a super-3 number, since 3×1218147659³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218147649) 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, 626294 + ... + 628235.

It is an arithmetic number, because the mean of its divisors is an integer number (304850790).

Almost surely, 2^1218147659 is an apocalyptic number.

1218147659 is a deficient number, since it is larger than the sum of its proper divisors (1255501).

1218147659 is an equidigital number, since it uses as much as digits as its factorization.

1218147659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255500.

The product of its digits is 120960, while the sum is 44.

The square root of 1218147659 is about 34901.9721362561. The cubic root of 1218147659 is about 1067.9886689475.

It can be divided in two parts, 1218 and 147659, that added together give a cube (148877 = 53³).

The spelling of 1218147659 in words is "one billion, two hundred eighteen million, one hundred forty-seven thousand, six hundred fifty-nine".