654099991 has 2 divisors, whose sum is σ = 654099992. Its totient is φ = 654099990.

The previous prime is 654099983. The next prime is 654100001. The reversal of 654099991 is 199990456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 654099991 - 2³ = 654099983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654093991) 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 as a sum of consecutive naturals, namely, 327049995 + 327049996.

It is an arithmetic number, because the mean of its divisors is an integer number (327049996).

Almost surely, 2^654099991 is an apocalyptic number.

654099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

654099991 is an equidigital number, since it uses as much as digits as its factorization.

654099991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 787320, while the sum is 52.

The square root of 654099991 is about 25575.3786091233. The cubic root of 654099991 is about 868.0566085211.

The spelling of 654099991 in words is "six hundred fifty-four million, ninety-nine thousand, nine hundred ninety-one".