654291409 has 2 divisors, whose sum is σ = 654291410. Its totient is φ = 654291408.

The previous prime is 654291383. The next prime is 654291431. The reversal of 654291409 is 904192456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570971025 + 83320384 = 23895^2 + 9128^2 .

It is a cyclic number.

It is not a de Polignac number, because 654291409 - 2²³ = 645902801 is a prime.

It is not a weakly prime, because it can be changed into another prime (654291439) 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, 327145704 + 327145705.

It is an arithmetic number, because the mean of its divisors is an integer number (327145705).

Almost surely, 2^654291409 is an apocalyptic number.

It is an amenable number.

654291409 is a deficient number, since it is larger than the sum of its proper divisors (1).

654291409 is an equidigital number, since it uses as much as digits as its factorization.

654291409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 654291409 is about 25579.1205673690. The cubic root of 654291409 is about 868.1412772548.

The spelling of 654291409 in words is "six hundred fifty-four million, two hundred ninety-one thousand, four hundred nine".