655847891 has 2 divisors, whose sum is σ = 655847892. Its totient is φ = 655847890.

The previous prime is 655847887. The next prime is 655847897. The reversal of 655847891 is 198748556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655847891 - 2² = 655847887 is a prime.

It is a super-2 number, since 2×655847891² = 860272912258295762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655847897) 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 as a sum of consecutive naturals, namely, 327923945 + 327923946.

It is an arithmetic number, because the mean of its divisors is an integer number (327923946).

Almost surely, 2^655847891 is an apocalyptic number.

655847891 is a deficient number, since it is larger than the sum of its proper divisors (1).

655847891 is an equidigital number, since it uses as much as digits as its factorization.

655847891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 53.

The square root of 655847891 is about 25609.5273482351. The cubic root of 655847891 is about 868.8291339609.

The spelling of 655847891 in words is "six hundred fifty-five million, eight hundred forty-seven thousand, eight hundred ninety-one".