654081899 has 4 divisors (see below), whose sum is σ = 654188040. Its totient is φ = 653975760.

The previous prime is 654081881. The next prime is 654081907. The reversal of 654081899 is 998180456.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654081899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654081809) 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, 43217 + ... + 56354.

It is an arithmetic number, because the mean of its divisors is an integer number (163547010).

Almost surely, 2^654081899 is an apocalyptic number.

654081899 is a deficient number, since it is larger than the sum of its proper divisors (106141).

654081899 is an equidigital number, since it uses as much as digits as its factorization.

654081899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106140.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 654081899 is about 25575.0249071237. The cubic root of 654081899 is about 868.0486051449.

The spelling of 654081899 in words is "six hundred fifty-four million, eighty-one thousand, eight hundred ninety-nine".