654703991 has 2 divisors, whose sum is σ = 654703992. Its totient is φ = 654703990.

The previous prime is 654703981. The next prime is 654703999. The reversal of 654703991 is 199307456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 654703991 - 2¹⁰ = 654702967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654703999) 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, 327351995 + 327351996.

It is an arithmetic number, because the mean of its divisors is an integer number (327351996).

Almost surely, 2^654703991 is an apocalyptic number.

654703991 is a deficient number, since it is larger than the sum of its proper divisors (1).

654703991 is an equidigital number, since it uses as much as digits as its factorization.

654703991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 654703991 is about 25587.1841162720. The cubic root of 654703991 is about 868.3237159455.

The spelling of 654703991 in words is "six hundred fifty-four million, seven hundred three thousand, nine hundred ninety-one".