654093991 has 2 divisors, whose sum is σ = 654093992. Its totient is φ = 654093990.

The previous prime is 654093983. The next prime is 654094031. The reversal of 654093991 is 199390456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 654093991 - 2³ = 654093983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654093901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327046995 + 327046996.

It is an arithmetic number, because the mean of its divisors is an integer number (327046996).

Almost surely, 2^654093991 is an apocalyptic number.

654093991 is a deficient number, since it is larger than the sum of its proper divisors (1).

654093991 is an equidigital number, since it uses as much as digits as its factorization.

654093991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 654093991 is about 25575.2613085380. The cubic root of 654093991 is about 868.0539543114.

The spelling of 654093991 in words is "six hundred fifty-four million, ninety-three thousand, nine hundred ninety-one".