1218531059 has 8 divisors (see below), whose sum is σ = 1239249552. Its totient is φ = 1197836640.

The previous prime is 1218531023. The next prime is 1218531079. The reversal of 1218531059 is 9501358121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1218531059 - 2¹² = 1218526963 is a prime.

It is a super-2 number, since 2×1218531059² = 2969635883495322962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218531079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117197 + ... + 127169.

It is an arithmetic number, because the mean of its divisors is an integer number (154906194).

Almost surely, 2^1218531059 is an apocalyptic number.

1218531059 is a deficient number, since it is larger than the sum of its proper divisors (20718493).

1218531059 is an equidigital number, since it uses as much as digits as its factorization.

1218531059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12037.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 1218531059 is about 34907.4642304479. The cubic root of 1218531059 is about 1068.1007035057.

The spelling of 1218531059 in words is "one billion, two hundred eighteen million, five hundred thirty-one thousand, fifty-nine".