654059891 has 4 divisors (see below), whose sum is σ = 654517752. Its totient is φ = 653602032.

The previous prime is 654059869. The next prime is 654059893. The reversal of 654059891 is 198950456.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654059891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654059893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226781 + ... + 229646.

It is an arithmetic number, because the mean of its divisors is an integer number (163629438).

Almost surely, 2^654059891 is an apocalyptic number.

654059891 is a deficient number, since it is larger than the sum of its proper divisors (457861).

654059891 is a wasteful number, since it uses less digits than its factorization.

654059891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457860.

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 654059891 is about 25574.5946399938. The cubic root of 654059891 is about 868.0388692448.

The spelling of 654059891 in words is "six hundred fifty-four million, fifty-nine thousand, eight hundred ninety-one".