1218541945 has 8 divisors (see below), whose sum is σ = 1462945536. Its totient is φ = 974370096.

The previous prime is 1218541943. The next prime is 1218541949. The reversal of 1218541945 is 5491458121.

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 1218541945 - 2¹ = 1218541943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1218541898 and 1218541907.

It is not an unprimeable number, because it can be changed into a prime (1218541943) 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, 46147 + ... + 67576.

It is an arithmetic number, because the mean of its divisors is an integer number (182868192).

Almost surely, 2^1218541945 is an apocalyptic number.

It is an amenable number.

1218541945 is a deficient number, since it is larger than the sum of its proper divisors (244403591).

1218541945 is a wasteful number, since it uses less digits than its factorization.

1218541945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115871.

The product of its digits is 57600, while the sum is 40.

The square root of 1218541945 is about 34907.6201566363. The cubic root of 1218541945 is about 1068.1038841960.

The spelling of 1218541945 in words is "one billion, two hundred eighteen million, five hundred forty-one thousand, nine hundred forty-five".