654984991 has 2 divisors, whose sum is σ = 654984992. Its totient is φ = 654984990.

The previous prime is 654984973. The next prime is 654985139. The reversal of 654984991 is 199489456.

654984991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 654984991 - 2⁹ = 654984479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654984391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327492495 + 327492496.

It is an arithmetic number, because the mean of its divisors is an integer number (327492496).

Almost surely, 2^654984991 is an apocalyptic number.

654984991 is a deficient number, since it is larger than the sum of its proper divisors (1).

654984991 is an equidigital number, since it uses as much as digits as its factorization.

654984991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 55.

The square root of 654984991 is about 25592.6745573807. The cubic root of 654984991 is about 868.4479268193.

The spelling of 654984991 in words is "six hundred fifty-four million, nine hundred eighty-four thousand, nine hundred ninety-one".