981815455 has 4 divisors (see below), whose sum is σ = 1178178552. Its totient is φ = 785452360.

The previous prime is 981815453. The next prime is 981815459. The reversal of 981815455 is 554518189.

It is a happy number.

981815455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554518189 = 17 ⋅32618717.

It is not a de Polignac number, because 981815455 - 2¹ = 981815453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981815453) 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, 98181541 + ... + 98181550.

It is an arithmetic number, because the mean of its divisors is an integer number (294544638).

Almost surely, 2^981815455 is an apocalyptic number.

981815455 is a deficient number, since it is larger than the sum of its proper divisors (196363097).

981815455 is a wasteful number, since it uses less digits than its factorization.

981815455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196363096.

The product of its digits is 288000, while the sum is 46.

The square root of 981815455 is about 31333.9345598346. The cubic root of 981815455 is about 993.9013672885.

The spelling of 981815455 in words is "nine hundred eighty-one million, eight hundred fifteen thousand, four hundred fifty-five".