1984121545 has 16 divisors (see below), whose sum is σ = 2722337280. Its totient is φ = 1359912384.

The previous prime is 1984121533. The next prime is 1984121549. The reversal of 1984121545 is 5451214891.

It is a cyclic number.

It is not a de Polignac number, because 1984121545 - 2¹¹ = 1984119497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1984121498 and 1984121507.

It is not an unprimeable number, because it can be changed into a prime (1984121549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71511 + ... + 95299.

It is an arithmetic number, because the mean of its divisors is an integer number (170146080).

Almost surely, 2^1984121545 is an apocalyptic number.

It is an amenable number.

1984121545 is a deficient number, since it is larger than the sum of its proper divisors (738215735).

1984121545 is a wasteful number, since it uses less digits than its factorization.

1984121545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26184.

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

The square root of 1984121545 is about 44543.4792646466. The cubic root of 1984121545 is about 1256.5779203191.

The spelling of 1984121545 in words is "one billion, nine hundred eighty-four million, one hundred twenty-one thousand, five hundred forty-five".