654969391 has 4 divisors (see below), whose sum is σ = 664194384. Its totient is φ = 645744400.

The previous prime is 654969377. The next prime is 654969397. The reversal of 654969391 is 193969456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 654969391 - 2²¹ = 652872239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654969397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4612390 + ... + 4612531.

It is an arithmetic number, because the mean of its divisors is an integer number (166048596).

Almost surely, 2^654969391 is an apocalyptic number.

654969391 is a deficient number, since it is larger than the sum of its proper divisors (9224993).

654969391 is an equidigital number, since it uses as much as digits as its factorization.

654969391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9224992.

The product of its digits is 1574640, while the sum is 52.

The square root of 654969391 is about 25592.3697808546. The cubic root of 654969391 is about 868.4410320581.

The spelling of 654969391 in words is "six hundred fifty-four million, nine hundred sixty-nine thousand, three hundred ninety-one".