655363981 has 2 divisors, whose sum is σ = 655363982. Its totient is φ = 655363980.

The previous prime is 655363937. The next prime is 655363987. The reversal of 655363981 is 189363556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 441210025 + 214153956 = 21005^2 + 14634^2 .

It is a cyclic number.

It is not a de Polignac number, because 655363981 - 2⁷ = 655363853 is a prime.

It is a super-2 number, since 2×655363981² = 859003895184336722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655363987) 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 as a sum of consecutive naturals, namely, 327681990 + 327681991.

It is an arithmetic number, because the mean of its divisors is an integer number (327681991).

Almost surely, 2^655363981 is an apocalyptic number.

It is an amenable number.

655363981 is a deficient number, since it is larger than the sum of its proper divisors (1).

655363981 is an equidigital number, since it uses as much as digits as its factorization.

655363981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 46.

The square root of 655363981 is about 25600.0777537882. The cubic root of 655363981 is about 868.6153961116.

The spelling of 655363981 in words is "six hundred fifty-five million, three hundred sixty-three thousand, nine hundred eighty-one".