654981823 has 4 divisors (see below), whose sum is σ = 655178368. Its totient is φ = 654785280.

The previous prime is 654981809. The next prime is 654981839. The reversal of 654981823 is 328189456.

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

It is a cyclic number.

It is not a de Polignac number, because 654981823 - 2²¹ = 652884671 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 (654981023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93186 + ... + 99967.

It is an arithmetic number, because the mean of its divisors is an integer number (163794592).

Almost surely, 2^654981823 is an apocalyptic number.

654981823 is a deficient number, since it is larger than the sum of its proper divisors (196545).

654981823 is a wasteful number, since it uses less digits than its factorization.

654981823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196544.

The product of its digits is 414720, while the sum is 46.

The square root of 654981823 is about 25592.6126645952. The cubic root of 654981823 is about 868.4465266612.

The spelling of 654981823 in words is "six hundred fifty-four million, nine hundred eighty-one thousand, eight hundred twenty-three".