1218546121 has 4 divisors (see below), whose sum is σ = 1312280452. Its totient is φ = 1124811792.

The previous prime is 1218546071. The next prime is 1218546127. The reversal of 1218546121 is 1216458121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 322382025 + 896164096 = 17955^2 + 29936^2 .

It is not a de Polignac number, because 1218546121 - 2¹⁵ = 1218513353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218546127) 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, 46867146 + ... + 46867171.

It is an arithmetic number, because the mean of its divisors is an integer number (328070113).

Almost surely, 2^1218546121 is an apocalyptic number.

It is an amenable number.

1218546121 is a deficient number, since it is larger than the sum of its proper divisors (93734331).

1218546121 is an equidigital number, since it uses as much as digits as its factorization.

1218546121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93734330.

The product of its digits is 3840, while the sum is 31.

The square root of 1218546121 is about 34907.6799716051. The cubic root of 1218546121 is about 1068.1051043419.

The spelling of 1218546121 in words is "one billion, two hundred eighteen million, five hundred forty-six thousand, one hundred twenty-one".