1218632545 has 48 divisors (see below), whose sum is σ = 1702048320. Its totient is φ = 830338560.

The previous prime is 1218632543. The next prime is 1218632557. The reversal of 1218632545 is 5452368121.

It is not a de Polignac number, because 1218632545 - 2¹ = 1218632543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218632543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2075742 + ... + 2076328.

It is an arithmetic number, because the mean of its divisors is an integer number (35459340).

Almost surely, 2^1218632545 is an apocalyptic number.

It is an amenable number.

1218632545 is a deficient number, since it is larger than the sum of its proper divisors (483415775).

1218632545 is a wasteful number, since it uses less digits than its factorization.

1218632545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 665 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 1218632545 is about 34908.9178434394. The cubic root of 1218632545 is about 1068.1303551255.

The spelling of 1218632545 in words is "one billion, two hundred eighteen million, six hundred thirty-two thousand, five hundred forty-five".