654947399 has 2 divisors, whose sum is σ = 654947400. Its totient is φ = 654947398.

The previous prime is 654947393. The next prime is 654947401. The reversal of 654947399 is 993749456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 654947399 - 2²⁸ = 386511943 is a prime.

It is a Sophie Germain prime.

Together with 654947401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654947393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327473699 + 327473700.

It is an arithmetic number, because the mean of its divisors is an integer number (327473700).

Almost surely, 2^654947399 is an apocalyptic number.

654947399 is a deficient number, since it is larger than the sum of its proper divisors (1).

654947399 is an equidigital number, since it uses as much as digits as its factorization.

654947399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7348320, while the sum is 56.

The square root of 654947399 is about 25591.9401179356. The cubic root of 654947399 is about 868.4313120268.

The spelling of 654947399 in words is "six hundred fifty-four million, nine hundred forty-seven thousand, three hundred ninety-nine".